The Xiaomi Mi 9 SE now has an upgrade to MIUI 11, which is based on Android 10. It confers various upgrade-specific features such as gesture-based navigation and system-wide dark theme. This build also adds MIUI's new Focus Mode, which is suspiciously simiar to OnePlus' Zen Mode.
https://www.notebookcheck.net/Xiaomi-releases-a-beta-update-to-Android-10-for-the-Mi-9-SE.439838.0.html
Android 10 is scheduled to be rolled out later. For example, Redmi 7 and Redmi Note 7 Pro shall receive it by March 2020. MIUI 11 tries to integrate Android 10 features natively for cross-version support across devices.
Android versions will soon be irrelevant.