It has been reported that Samsung has had to pause the rollout for the Android 11 One UI 3.0 update for the Galaxy S10 series. The reasons for the halt have yet to be divulged but it's likely bugs have been discovered. The Samsung Galaxy S10 Android 11 One UI 3.0 update was only first made available a couple of weeks ago.
https://www.notebookcheck.net/Samsung-halts-Android-11-One-UI-3-0-update-rollout-for-the-Galaxy-S10-due-to-possible-bug-issues.516254.0.html