I think we're going to have to wait until the morning of Tuesday 4 June for the config to open.
Having had business dealings with US companies on the West Coast, my reasoning is:
The config can't open until after the SUTI date of Sat 1 June.
The config page and decision to go live is driven from the factory in Fremont, California.(i can't see such a global site having any Australian input)
California is 16 hours behind us, so assuming office hours of 0800-1600, the config page goes live overnight on Monday night or, more likely, during the sweet spot on our Tuesday morning 0800-1000 when it's 1500-1700 Monday afternoon over there.