Can you share that order status tool? I'm assuming it's something other than the normal T-Mobile order status page.
Sorry I'm just jumping back into the waters. I have a brand new order placed today (so I'll get it on or before the 6S is released).
There are two:
This is the standard T-Mobile order status page that will say 'Backordered' until the product ships, so it's pointless to check.
https://account.my.t-mobile.com/myphone/checkorder.html
This is the iPhone order status tool that is supposed to update every weekday night.
https://explore.t-mobile.com/order-status