According to the information, the Galaxy S20 Ultra is getting a new One UI 3.0 beta with software version G988BXXU5ZTJF and size is 600MB. It also comes with the October 2020 security patch.
As reported by Sammobile, the latest beta update improves the camera experience of the Galaxy S20 Ultra. It also brings problem with the ultra-wide sensor.
If you want to check for the latest software update, just head into the device Settings, select the Software update menu, tap on the Download and install option.
You can read the complete round-up here – Samsung One UI 3.0.