Here:
nostr:npub1235tem4hfn34edqh8hxfja9amty73998f0eagnuu4zm423s9e8ksdg0ht5
One of their moderators posts here regularly:
nostr:npub1c9d95evcdeatgy6dacats5j5mfw96jcyu79579kg9qm3jtf42xzs07sqfm
You may also be able to follow #grapheneos official Fediverse account through the #mostr bridge.
Discussion
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That bridge appears to be offline
It's missing a lot of posts there: https://grapheneos.social/@GrapheneOS
I have all the mastodon relays blocked so I am not sure which one works, sorry!