pizzadequeso any update on this? P9 phones are getting airdrop soonish.
Google rolling the feature out to various Pixel models running their closed-source OS doesn't make it more likely that GrapheneOS will get the feature. So if in two months they roll it out to Pixel 8 devices running their OS, that will have no bearing on GrapheneOS.
It remains to be seen whether Google will share the code with some or all of their OEM partners (e.g., Samsung, Sony) and also whether Google will contribute the code to AOSP. If the code ends up in AOSP it is likely that GrapheneOS will ship it quickly. If the code never ends up in AOSP it still might happen that the GrapheneOS project might find a way to make it available, or maybe not, but probably not soon.
Short answer: no update now, probably no update for months to come, unlikely there will be any update for GrapheneOS before the feature is on Samsung devices, and maybe not even then.
Please note that I don't speak for the GrapheneOS project.