DO A CHAT WITH APPLE TO CHANGE SHIPPING ADDRESS!!!!
It took like an hour before I got connected, but the CSR changed the shipping address on my order, still showing 9/16 delivery. As mentioned a little above, I am on AT&T Family Plan and my phone was shipping to my parents house a few hours away. Figured I'd do a chat, worth a shot, and got the address changed within about 5 minutes, once I got connected to an agent. The change was reflected on my order status before the chat was even over. I also just got an update through Apple Pay that the tax on my order was updated (Northern VA has a higher sales tax than back home).
This is what I'm gonna do now. Same situation, family plan is under my parents' address (only they're only 15 mins from me lol). Thanks for the heads up!