It won't ever come. I use InSync on ubuntu and it works exceptionally well. I actually upgraded to the paid 200GB Google drive plan because I started using Drive dramatically more once I installed InSync.
Insync is outstanding (https://www.insynchq.com/). It's better than the native Google Backup and Sync and works in Linux with multiple desktop variants. It also syncs MS OneDrive. One time purchase. It works great.