I see they appear to have recently put a collar on the one spiral out in the open behind Walt. Maybe it will go up today. Probably not, but maybe.
They also just got the middle back stay up for the southeast diagonal wall. I can a second is up to the east of that one. That means there is only one more back stay to put up; the one that strattles the southeast diagonal wall and the south wall.
If my math is right, 15 of the 16 back stays are now up (though some work remains to be done on a couple of them).