Thought I would share my Apple Watch Series 4 pre order experience.
Currently in Miami, FL for work, however live in Orange County California. I have had previous Apple products (iPhone X, etc) shipped to me here in Miami so there's no issue with that.
For me the Apple Store app wasn't up until just after 3:03 AM EST (First accessed via ATT iPhone X)
The website was up later at around 3:09 AM EST (Website was accessed through both Safari and Chrome via late model 2016 12" MacBook)
Had 2 different iPhone X's (ATT & Verizon) constantly refreshing the app. (Opening app, force close app, repeat)
Both iPhones not connected to wifi. (ATT signal 2 bars, Verizon signal full strength)
ATT iPhone X accessed the Apple Store app first just after 3:03 AM EST followed by Verizon iPhone X around 3:04 AM EST.
Order placed on the Apple Store app via ATT iPhone X for:
44mm SS White Sport Band with AppleCare+
Order placed seconds before 3:05 AM EST and got an estimated delivery date past the launch date.

I was quoted Sep 28 - Oct 2 delivery at the
final page for checkout and again on my
email confirmation.
Immediately after placing the order on my ATT iPhone X, I checked my Verizon iPhone X and the shipping date was already pushed back to Oct 2 - Oct 5.
I should add that when I gained initial access to the product page, then added to my cart and then proceeded throughout the checkout process it showed a Sep 21 delivery date. It
wasn't until the final screen/page before confirming the order did it show the dreaded Sep 28 - Oct 2 date.
I have yet to receive anything (iPhones...6,6s+,8,X, MacBooks...too many to list, iPads, or Apple Watches...1,2) prior or on a launch day when preordering at the time I gain access. (All shipping info and billing info already on file).
Time will tell if its the same for the Apple Watch Series 4...fingers crossed.
In the end the lottery on who gains access before others is becoming more and more frustrating each year...