They've had the camera glasses part for a few years now.
https://www.wsj.com/tech/personal-tech/metas-ray-ban-smart-g...
I've only noticed some influencers wearing them in Web videos, where they look prominent, like I should also be able to recognize them in-person.
Maybe people are only wearing them at home or in the office? Maybe it's mostly a California techbro regional thing?
Maybe I'm not paying enough attention. I will start consciously looking for them.
There are about 50M foldables in use, probably 30X as many in use as the Meta Ray-Bans, and I see one of those every couple of years and the only pair of Meta Ray-Bans I've seen in the wild has been a blind friend who got the first generation early because of its accessibility capabilities.