GrapheneOS support for Fairphone is unlikely to ever happen. Their hardware is too insecure to satisfy GrapheneOS’s reasonable requirements and have stated that they aren’t interested in improving it. Software is also lacking and they’ve partnered with Murena, who has been slinging shit at GOS
On a more positive note, due to the AOSP/Pixel drama there now is a real possibility a different major OEM will be supported: https://grapheneos.social/@GrapheneOS/114711328082841462
Fairphone’s… phones are sold in the USA through Murena. They’re preloaded with /e/OS.