A few pages back someone said that Apple said via chat to them that they will ship batch one on the 9th or 10th and they'll be delivered by this weekend.
I believe this could be true from past experiences with Apple launches.
Some people said they got "express shipping", which is a lie (or they got finessed out of their $14 or however how much from Apple) as they always use the fastest shipping for new products. This being 2 Day Air for most of us or 2-3 days shipping, so the first orders should be coming in Friday/Saturday.
On top of that myself along with many other people who ordered stock machines haven't been charged yet, I believe this is because the BTOs for the first batch are being built and set aside and because of their assignment to people they are being charged now. Obviously stock orders are mass produced so I'm assuming once it ships there will be a mass amount of stock people getting their shipped notifications at the same time (again I've seen this happen before so it wouldn't be a surprise).
At the end of the day who knows, but usually Apple will delivery about a week earlier than they say and for us first batchers that's this weekend.