MIUI 12 is now official, with Xiaomi’s latest skin offering an array of new features. Some of those features include an improved system-wide dark mode, AI-assisted calling features, Dynamic Always-on Display, new visual design, tweaks to system animations, and much-needed privacy fixes.

Xiaomi is now rolling out the stable MIUI 12 update to a lot of phones in the Redmi, POCO, and Mi series. The first wave of devices received the update back in July, and the second wave of phones started receiving the update in August.
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https://www.androidcentral.com/heres-when-your-xiaomi-redmi-or-poco-phone-will-get-miui-12-update