Xiaomi may have only just announced MIUI 13 outside China, but it has already brought the new OS to the POCO F3 GT in India. V13.0.0.10.SKJINXM also arrives with Android 12, but only for Mi Pilot testers.
https://www.notebookcheck.net/Xiaomi-brings-MIUI-13-and-Android-12-to-the-POOC-F3-GT-with-Mi-Pilot-build.597745.0.html