Xiaomi's official MIUI 12.5 device list is rather lacklustre; only eighteen devices are confirmed to receive the OS update so far. Reportedly, Xiaomi is testing MIUI 12.5 on over three dozen handsets, including the Mi 8 and Redmi Note 8 Pro.
https://www.notebookcheck.net/Xiaomi-reported-to-be-testing-MIUI-12-5-on-over-40-devices.532947.0.html