Anyone who has purchased a game on the exclusive platform of Bethesda.net will be able to migrate their purchases to Steam as of May 11th. After May 11th, the library and the launcher will not be accessible, but users should begin the process as soon as possible.
Your entire game library and wallet will be accompanied by all of your saved games, meaning that you shouldn't have to worry about losing your 500+ hours of play time. We recommend backing up those files before you start the process.
Your credentials will remain the same for titles that require an account, like Doom Eternal and Fallout 76.
Here is a list of affected games that have been available on the platform, if you are unsure of whether you actually have any games on the Bethesda.net launcher. Many of these games have been hosted on Steam at the same time.
To find any saves you might have and back them up, the default location for any saves made through the Bethesda.net launcher is shown in this handy guide.
The process for moving your games is very easy, even if you don't have any saves. Click on the transfer library button to log into your account.
This utility will prompt you to link and verify your account if you haven't already done so. Once you confirm which games are moving, you are good to go.
The process is fairly straightforward, but there is an FAQ that offers a more comprehensive list of questions.