The Poco X2 is likely to get the stable MIUI 12 update sometime in August as confirmed by a moderator in the official Poco India Telegram channel. This response comes in the wake of many users querying the company on Twitter, especially after knowing that the Poco X2's Chinese counterpart, the Redmi K30 4G, has already received two MIUI 12-related updates.
https://www.notebookcheck.net/Poco-X2-owners-miffed-at-not-receiving-MIUI-12-Xiaomi-confirms-update-will-likely-arrive-in-August-but-provides-no-ETA.482758.0.html