Hi davewagdy!
It is the developer (Google) who need to build the support for Apple's CarPlay system. Read more about that here: https://developer.apple.com/carplay/
As far as I am concerned, Google Maps is not available in Apple CarPlay. However, other third-party map apps might have this support, and at least Apple Maps (maps.apple.com) does support the Apple CarPlay system.
Drive safely,
Petter