Previously available only in closed beta, the newest version of Xioami's UI, MIUI 12, is now being pushed to some Mi 9T handsets or also known as Redmi K20 in India and other markets. The full version of the software is 12.0.0.11.
Of course, it's based on Android 10 and brings lots of improvements and tweaks over the previous MIUI 11. The UI is rather new, there's the new Dynamic Clock on the lock screen available, customizable always-on display, dynamic video wallpapers and some under the hood changes and optimizations.
You can either wait for the OTA to arrive to your phone, or you can always try to install it manually