Upon launching the game, the only thing that happens is it displays the global release time screen. I have tried verifying files. I have also tried deleting the exe and then verifying files.
I am having this issue too, after restoring the latest windows 10 update (as it breaks cortana and search bar functionality).
As you did, I also attempted to verify files and deleted the executable.
I fixed the issue for myself by moving the C:\Program Files\Epic Games\Borderlands3 contents elsewhere and uninstalling the game. I then started installing fresh until around 2%, then used task manager to kill the launcher.
I then moved the Borderlands3 contents back into the folder, minus the .egs folder. When I loaded the launcher up, it verified the files and installed it- back to a playable state.