Most hardware doesn't support the fundamental security requirements of GrapheneOS, so that will never happen.

Look into things like /e/OS or Nothing Phone on the Android side, and the various Linux options (Jellyfish OS is, I think, the most advanced).

"Unfortunately" they prioritize security and no phones but Pixels and their upcoming Moto have all the necessary hardware.

If you don't care as much about security however and just want to get away from google there's plenty options, like LineageOS or /e/OS.

Personally I wanted both, so one day when it was time to switch phones I bought an unlocked Pixel instead of some Samsung with a fancy camera. Android users could all do that tbf, it's not like phones last forever these days, the question is if they prioritize security and privacy or features (that will probably be different on GrapheneOS anyway, that fancy camera is only so fancy because of the onboard processing done by the phone, your pics won't look as good on Graphene.)