They could have already been well into the first week of powerdown. A few more days and 1/13 of those tokens would already be made available to the public, PLUS those exchanges would have had a head start on returning to business as usual.

And those exchanges don't need permission from anyone to initiate this powerdown. They could be doing that on their own. I could start a full powerdown now, and doing so would take less time than the time it takes to complete this sentence.