How long does a T-Mobile backorder take?

I ordered 2 iPhone 5's just 2 days ago. They said that it was put on backorder the next day.
They said that they don't have any in stock right now.
That iPhone 5 being advertised by T-Mobile is in HIGH demand right now.
So, I'm assuming that the shipment to their warehouse from Apple shouldn't take long to ship those iPhones over to T-Mobile, right?
I'm pacing and so anxious and excited for my iPhone right now, and I just can't wait for it to come!
My mom called today though, and told me that they told her that the iPhones have arrived at the warehouse this morning. Does this mean I'll be getting my iPhone(s) soon?

Added (1). Btw, on my online t-mobile account, it still indicates that my ordered items are currently on backorder. I wonder why.

You'll probably get your phone soon, because they got to the warehouse. But if you didn't know that, it would be impossible to say how long they could be backordered. All backordered means is that the item is for sale but they don't have any in stock - that means if you're lucky it could be a few days, if you aren't it could be weeks.