Xiaomi has reportedly started its rollout of the second batch of MIUI ROMs, with the Snapdragon 845-powered Mi MIX 2S and the Mi MIX 3 already getting an official stable update. This comes shortly after the company released MIUI 12 for phones like the Mi 10 and Redmi Note 9
https://www.notebookcheck.net/Xiaomi-rolls-out-second-batch-of-stable-MIUI-12-ROMS-starting-with-the-Mi-MIX-2S-and-Mi-MIX-3.485576.0.html