It's heavily dependent on where you're coming from and traveling to. NSW/SA just removed a mandatory 14 day quarantine this week, I imagine some restrictions will change as filming goes on.
Beau's coming from Sydney, but no idea where they're heading to. Bottom line is though that QLD has strong quarantine restrictions, to the point there's excessive media coverage slamming it. Most people leaving NSW are required to undergo quarantine anywhere they go. As far as I understand, no VIC teams are reportedly involved this season due to the high cases in Melbourne at the moment.
I think we'll need to see where they start and from there figure out which states they can or cannot enter without quarantining. Best bet to do that is refer to the state government's website for the official requirements.