They are still not implemented in major browsers and operating systems (e.g. Linux Chrome), so not likely much traction.

I've got no overall stats but they are very well integrated in to iOS. You could end up using them without really even knowing what passkeys are. Websites and apps just prompt you with "add a passkey" and if you hit accept you get one and it gets synced to all your other Apple devices and just works.

I don't use them much because I don't have a good way to register them and use them across device ecosystems. I use all three OSes regularly.

I hope 1Password release passkey unlock for vaults soon. Then I'll never have to enter the passphrase to unlock again, and my "passphrase" will be essentially the unlock code for my phone.

Yep