A refreshed list of Xiaomi, Redmi, POCO, and Black Shark devices that will or will not be updated to Android 12 has recently been published. The unofficial list features numerous changes from the last one, including the news that the POCO M3 has been relegated to the "won't get Android 12" column.
https://www.notebookcheck.net/Latest-Xiaomi-Android-12-update-list-relegates-the-POCO-M2-promotes-the-Redmi-9T-and-moves-the-Mi-10-to-internal-beta-testing.551194.0.html