Samsung plans to upgrade at least 41 devices to One UI 3.0 by September 2021, according to an official upgrade plan. The company will begin with the Galaxy S20 series this month, before moving onto the Galaxy S10, Galaxy Note 10, Galaxy Note 20 and Galaxy Z series. Most devices will not see One UI 3.0 until April 2021 and later, though.
https://www.notebookcheck.net/Samsung-announces-One-UI-3-0-and-Android-11-upgrade-schedule-for-41-devices.507548.0.html