If your Apple Watch is scheduled to arrive tomorrow, you should have received an email from Apple--and possibly an Apple Store notification--that the Watch is in transit.
Over here at Macworld, my own Watch is scheduled to arrive on Friday (dragging myself out of bed at 3 a.m. Eastern paid off!). We're hearing anecdotally that the 38mm Watch Sports with white bands are more likely to arrive tomorrow, while readers who pre-ordered Sports with black bands report that their orders are still processing.
Caitlin McGarry