It will be included in android 10 which will be released in mid of 2020
Mid 2020 ?
Beta will probably start in December itself .
Zenfone 5z and 6z got 4 betas based on android 10 (every beta had a gap of one week )
So beta period will last approximately an month
Stable android 10 can be expected by January on Rog phone 2
This is for the phone running on global Ron
Tencent version (CN version) has a different software team so time can differ