Hi9 Pro JDT Android 9 Release details

I have a Chuwi Hi9 Pro JDT , 8.4" Tablet, and cannot use voice dialling on it, due to issues with the build of Android 8. I am also worried about security, as no updates besides the native version 8.0.0 are on the device. Can anyone advise when Android 9 is going to be available for download or OTA ?