Mine too says prepared for shipment, I ordered mine around 8:30pst on June 15. I just went through all this with my iPad last month, and remembered it shipped about 12hours or so after it went to "prepared for shipment" it then took about 3 days for it to get here. So if it ships tomorrow, I'm guessing delievery by next Monday for me.
Crap, means no phone for about a week or so... sucks to be me. On the plus side means more time to study