Android Pie has been on the market for a long time, however, only now we can see the update calendar presented by Xiaomi. This schedule applies only to the fourth quarter of 2018.
Xiaomi mi Mix 2S, Mi 8 or Mi 8 EE have already received an appropriate update. Soon it will also go to most smartphones from the mi 8 series. However, structures such as Redmi 5, Redmi 5A, Redmi 5 Plus, Mi 5X or others will only receive Android Oreo. It is also known that some models will not receive an update at all. These are the smartphones that have been updated at least twice, so they are quite old designs.
Nevertheless, they may receive security fixes. We do not know which phones are because Xiaomi does not mention anything about them. If you are missing a smartphone on the list, let me know in the comments.
Also read: See night photos taken with Xiaomi Mi Mix 3