After sending out the highly awaited MIUI 12 update to the European version of the Redmi Note 9S, Xiaomi has now expanded the rollout by sending a similar update to the global variant of the device. The Mi A3 also happens to be receiving the October security patch.
https://www.notebookcheck.net/New-updates-arrive-for-the-Mi-A3-as-the-Redmi-Note-9S-also-starts-receiving-MIUI-12-globally.499478.0.html