What’s PQ story with passkeys? Considering all the hype that everything needs to be pq safe by 2029 (or whatever), wouldn’t it make sense to delay adoption? Otherwise a db leak would compromise every single account in a pq world.

Most Passkeys use PQ PKI algorithms. From statistics I've seen most are Elliptic Curve on currently recommended PQ curves.

For better and worse, Webauthn is one of the "choose your own adventure" PKI systems where the keys themselves suggest which PKI algorithm/details they use. This is partly because Webauthn has been around a long time and has had to backwards compatibly support a wide variety of physical security keys over the ages.

Most good open source libraries for implementing passkeys will do a good job of limiting passkeys to known good algorithm choices, including any PQ requirements/suggestions. The Passkey standard itself also sets a "higher water" baseline above Webauthn's supported algorithm list.