Is it already possible to buy a buy a USB-pendrive-style authentication key that is compatible with WebAuthN?

If yes, what technical standard/specification should it support?

According to press releases such as [this](https://mobileidworld.com/yubico-hardware-key-fido2-webauthn-904104/), it is already possible, but I would like to know whether this is Yubico trying to be first to market and releasing something that may not be compatible, or if a key such as the one referenced in the press release is compatible because it implements the FIDO2 standard.