I found this app that detects nearby meta glasses and had a brief discussion with the developer.
https://github.com/yjeanrenaud/yj_nearbyglasses/
They said it is non-invasive and collects no user data, and needs no google play services to work.
It seems legit and developer seems legit but realistically, I don't feel I'm qualified to determined if the app is safe by looking at the information available.
Wondering if anyone has tried it with GrapheneOS.
Also has anyone checked it out as far as privacy and security?