The Samsung Galaxy Note20 Ultra 5G locked to AT&T, T-Mobile, and Verizon's network has already received the Android 11-based One UI 3.0 stable update, and now it's the Note20 Ultra 5G locked to Sprint's network that's getting a taste of Samsung's newest custom Android skin.
The vanilla Note20 5G on Sprint's network is also receiving Android 11 with One UI 3.0. The new builds for the regular Note20 and Ultra models have version numbers N981USQU1CTL2 and N986USQU1CTL2, respectively.
The One UI 3.0 update is rolling out over the air and should reach all the units in a couple of weeks. But if you can't wait for an update notification to pop up on your device, you can try checking for the update manually by heading to the Settings > Software update menu on your phone.