I ordered last night, around 8:30 est. The Apple site and my email receipt both said "delivered by June 19th". I didn't change any of the default shipping settings.
If you changed the default shipping settings it may be calculating the delivery date by that.
I would tend to believe that even if it says a different delivery day, you would still get it on the 19th.
Some people were saying, they cancelled their order, went back in, left it on the default shipping selection and the new receipt and confirmation both said "delivered by June 19th".