Xiaomi continues to support the aging Mi A1 with software updates, but this month's security patch does not include any new features. Sadly, this confirms that any chance to receive Android 10 via the official channels is now gone. However, a stable Android 10-based LineageOS build for the Mi A1 should arrive this summer.
https://www.notebookcheck.net/There-s-a-new-Android-system-update-available-for-the-Xiaomi-Mi-A1.463118.0.html