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The update carries a model number N986USQU1CTL2 and a download size of around 2.6GB. The update does not reveal the changelog but it brings a redesigned UI and a lot of new features. It upgrades monthly security patches to December 2020. The update brings an overhauled Notification panel, Bixby Routines, AOD customizations, redesigned volume control layout, and Android 11 features.
The Android 11 based One Ui 3.0 update is rolling out as OTA. It may take some days to reach your Note 20 / Note 20 Ultra 5G. In the meantime, you can check it manually by heading to Settings -> System -> Software update.