My Apple Watch shipping timeline. I hope it helps others that are anxiously waiting!
I ordered a 42mm Stainless Steel Case with Black Classic Buckle on April 10th at 3:01 p.m. PDT. On May 20th at 9:00 p.m. my credit card was charged and the Watch order status moved to Preparing for Shipment. On May 21st at about 2:00 p.m. I received a text that the order was shipped. My UPS account emailed a notice that the shipment was sent Next Day Air Saver, and will arrive on May 22nd between 12:15 p.m. and 4:15 p.m. The order showed "Standard Shipping", but it was actually sent Next Day.
So, I ordered on the first day it was available, in the afternoon, and it took six weeks. Longer than I expected for ordering on the first day, but at least it's finally on the way!