Redmi k20 starts getting an Android 10 update based on MIUI 11. some users on mi community has shared the screenshot of the update, as you can in the image below, system is updated to Android 10.
The December security patch update for Redmi K20 is also combined in this update. The size of this update is 2.2GB. Well, In order to ensure the stability of this OTA, it will have a staged rollout. The OTA will be randomly pushed out to a limited number of users and will have a broader rollout in a few days after making sure there are no critical bugs. If no critical bugs are found, the full rollout will be completed in the upcoming days.