Just chked my order. IT said it CAN BE changed, the status "Waiting to be filled". I guess if it said it CAN'T, then it's being filled already. Also they might ship it out of a warehouse instead of a local store, (do u have a store near u?) so I guess it'll take 3 days.
I have a store 10min from me, so it's 1day delivery, but I'm picking it up today just to be sure.