They usually ship about 30 days before and can take anywhere from a couple of days to a couple of weeks to show up.
Have they been shipped yet? If so, there should be a tracking number if you log into MDE, which you can use to track with USPS. They get sent Parcel Post, so sometimes they take a very, um, creative route to get to the destination. I live in Atlanta, and one set of bands shipped out of Davenport, FL went all over the midwest before arriving in Atlanta nearly two weeks after they shipped.