Updated information: April 27, 2022
from Bethesda website news portal

https://bethesda.net/en/article/2RXxG1y000NWupPalzLblG/sunsetting-the-bethesda-net-launcher-and-migrating-to-steam

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Sunsetting the Bethesda.net Launcher & Migrating to Steam
February 22, 2022 article posted at Bethesda website news portal:

https://bethesda.net/en/article/2RXxG1y000NWupPalzLblG/sunsetting-the-bethesda-net-launcher-and-migrating-to-steam

We’re saying goodbye to the Bethesda.net Launcher this year. Starting in early April you’ll be able to migrate your games and Wallet to your Steam account. For more details on what this process will look like, read on.

We’re saying goodbye to the Bethesda.net Launcher this year. We would like to thank you for your support and assure you that all of your games are safe. If you’re not playing PC games through the Bethesda.net launcher then your work is done here. Thanks for reading! If you do have games through the Bethesda.net launcher, don’t worry. Starting in early April you’ll be able to migrate your games and Wallet to your Steam account. For more details on what this process will look like, read on.
You have plenty of time to plan and begin migrating your Bethesda.net library to your Steam account. The migration to Steam will include your game library and Wallet – meaning you will not lose anything from your Bethesda.net account. Many games will also have their saves migrated, with a few requiring some manual transfers. For games that require it, you will still use your Bethesda.net login to sign in to play. Your Bethesda.net account will not be lost and will still be accessible on our website and in-game, and we will continue supporting all Bethesda.net accounts with our future titles.

Next Steps
In early April, you will be able to initiate the migration process following detailed instructions we will have available to you then.
We expect you to have a lot of questions and encourage you to take a look at our comprehensive FAQ below. For those of you looking for questions specific to Fallout 76, in addition to the below FAQ we also have a Fallout 76-specific FAQ on Fallout.com.
Until May, you will still be able to access and play your games on the Bethesda.net Launcher, but we suggest that you start the migration process as soon as it’s available.

FAQ
Q: How will I play my games?
A: We encourage our Bethesda.net Launcher community to continue their experience on Steam. In early April, you will be able to migrate your Bethesda.net library to your Steam account. Any title you own on the Bethesda.net Launcher will be available to you free on Steam. Your purchases will carry over to your Steam account. Many game saves will also transfer, however some may require manual copying. For more information on which games will require you to manually move your saves, please see our FAQ Entry "What happens to my game progression and saves?".

Q: What will happen to the Bethesda.net launcher?
A: You will continue to have access to the Bethesda.net Launcher and access your games until May. Starting in May, you will no longer be able to play and access your games within the Bethesda.net Launcher.

Q: Will I still need a Bethesda.net account if I no longer use the launcher after transferring to Steam?
A: Yes. Many of our games and services still rely on you to have a Bethesda.net account. This will allow you to retain access to Bethesda.net services including game mods, in-game items like skins, and access to exclusive news and updates.

Q: Will I have access to the games I own on the Bethesda.net launcher available to me on Steam?
A: Yes. You will need to take the steps to transfer your Bethesda.net account info to your Steam account. Once the migration process to Steam is available, we will let everyone know and update this FAQ with the link on where and how to migrate. Please note, that you may begin this process at any time after it becomes available, but in May you will no longer be able to play your purchased games on the Bethesda.net launcher. You will not lose access to your Library on Bethesda.net in May, only the ability to play them on the Launcher.

Q: What happens to my game progression and saves?
A: Should you choose to transfer your Bethesda.net library to your Steam account, we will provide instructions on how to migrate your game progression and saves over to your Steam account where possible, so you may continue playing where you left off. Some saves will automatically transfer, however some will require you to manually copy them to your Steam folder. We will have more information on manually transferring saves soon. At this time, we expect almost all save progress to be transferable automatically or manually with the exception of Wolfenstein: Youngblood, which currently is unable to transfer.
Virtual currency balances and game add-ons such as DLC and in-game skins will automatically transfer.

Q: Will my in-game virtual currency (Atoms, etc.) be moved to Steam?
A: Yes. Your Bethesda.net Wallet will transfer over to Steam once you have completed the transfer process.

Q: Can I migrate to PlayStation or Xbox instead of Steam?
A: No. We are only able to support transferring your Bethesda.net account information on PC. We cannot transfer PC account information to consoles.

Q: May I migrate my account to another PC service instead of Steam?
A: No. We are only able to support transferring account information from the Bethesda.net launcher to Steam.

Q: Does the Launcher closing affect my Bethesda.net account?
A: No. You will still need to login to your Bethesda.net account to play our live titles such as Fallout 76 and access other services offered. Our games will continue to use a Bethesda.net account in the future.

Q: What about Fallout 76?
A: We have a comprehensive Fallout 76 FAQ available here.
https://fallout.bethesda.net/en/article/FfWIVEmUL8vXXpAtkYnCT/farewell-bethesda-net-launcher-fallout-76-faq

Q: Are all the same languages supported?
A: Yes.

Q: Will friends lists be merged? Will I need to re-friend friends I added on Bethesda.net?
A: Games that have the Bethesda.net Friends List will be merged after migration. This includes Fallout 76, DOOM Eternal, Wolfenstein: Youngblood, The Elder Scrolls: Legends, Rage 2, and DEATHLOOP.

Q: Will the Bethesda.net Launcher sunset affect my ability to play The Elder Scrolls Online on PC?
A: No. The Elder Scrolls Online is unaffected by this change.

Please continue to visit Bethesda.net and follow our social channels for any updates. To our Bethesda.net PC Community, thank you for your years of support and we look forward to continuing to supply you with great games on Steam.