Given the ten-day weather forecast you may not have anything shipped up next week. I'm watching mine b/c I'm also waiting for a snake to be shipped in, and it looks like Ol' Man Winter is going to come back with a vengeance.

I would still wait 90 days before pairing them, as sometimes shipping stress can cause a problem to crop up. If the snakes are from the same breeder you could probably QT them together safely, unless it's one of the really big operations where they may have separate facilities housing their animals.