A new leak detailing Xiaomi's plans for the release of Android Pie has surfaced. According to the sources, devices like the Mi Mix 2 and Mi 8 phones are all set to receive the Pie update before the year runs out, while offerings like the Mi Note 3 will have to wait till Q3 2019 next year.
https://www.notebookcheck.net/Pie-update-roadmap-for-Xiaomi-devices-surfaces.357346.0.html