I am the maintainer of pkarr.org, and I designed and implemented most of pubky core (the protocol that the app is built on).

I no longer work at Synonym, so I don't have privileged insight on when they will allow users to try the beta.

If anyone can answer you it would be nostr:nprofile1qqsgeksa4tajm7x673gq2v7t56dkgkh6pjhhzdhrgxlpke4za8jmmkqpz9mhxue69uhkummnw3e82efwvdhk6qgjwaehxw309ac82unsd3jhqct89ejhxjylycj