I just recieved a rockpro64 and have a pinebook on the way ... early chrissy presents from the dog. No rush to install ... how far away is the 6.0 kernel

There has been at least one package that needed patching to build against the Linux 6.0 headers, so we're waiting on Patrick to upgrade it. I'm not in a rush so I didn't ask if he's looked at it yet.
You can upgrade to 6.0 when it's available using upgradepkg, and the dog can provide company whilst you do the installation.
You can also build your own 6.0 package using the Kernel customisation document, but use 'source/k-wip' instead of 'source/k'. I only tested the resulting 6.0 package on the RPi4, but if I were a betting man I'd say it works fine on the RockPro64 and Pinebook Pro as well (although in part that's because Brent already did it).

Yeah my Pinebook Pro and RockPro64 are both running Linux 6.0.1. I used the kernel config in slackwareaarch64-current/source/k-wip/. Once we get a few more release candidates of the 6.1.y kernel, I will start testing that.

Thanks for the replies. Pinebook Pro arrived yesterday. Time to get busy.