Boot into Safe Mode and update from there finally made the 11.1 update work for me. MacBook Pro (16-inch, 2019)
taliesinangelus
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
I'm having the same issue and also let it run overnight - no change from "about 10 minutes remaining."