Only 4 days after the previous update, TL5, Samsung have started rolling out their 3rd stable Android 11 update to their Global, Exynos, S20 flagship devices... SM-G98*F/B
This release appears to be mainly for bugfixes and an update to the camera.
It is a FOTA, (Firmware Over The Air), update and you should check... Settings > Software update... to see if it has arrived for you.
Be advised, initial roll-out is mainly to stock Samsung unbranded devices and it may take longer to arrive on some carrier branded models.
The update = G98*F/BXXU5CUA3
Download size = 450.69MB
Build date = 07 January 2021
One UI version = 3.0
Camera version = 11.0.01.20
Android Security patch = January 2021
This is the 19th stable update in 307 days = 1 update every 16 days on average
The new update for the U.K. O2 network carrier branded devices, CSC code O2U, has been released.