Just like the ZenFone Max Pro (M1) and Max (M2), the update for ZenFone Max Pro (M2) is also currently seeding only in India, and there's no word on when these smartphones would get the Android Pie goodness in other regions.
That said, the Android Pie update for ZenFone Max Pro (M2) is rolling out over-the-air and could take a week or two to reach all the units in the country. It carries version number 16.2017.1903.061 and comes with March security patch instead of the latest April patch.
After update from 8.1.0 to latest my max pro m2 became too slow...Too boating..It takes too much time in charging...And the service center I visited was very amature, non professional and have no technical knowledge and expertise.
Fully agree with you