I just called the number, and she confirmed mine was on a truck for delivery anytime after 10:30am CST and 4:30pm CST.
I asked for more explanation and she indicated that FedEx had to honor all Priority deliveries first. I went on to tell her about the truck that delivered to a house on my street around 9:00am, but nothing for me, and she said they only have Priority deliveries on that particular truck; once those are deilvered, then non-priority packages start getting delivered by a different truck.
Doesn't make total sense, but hope it's true. I guess I'll find out one way or another sometime after 10:30am CST.
It makes sense for me at least. I always get packages early afternoon, and in the morning a FedEx truck goes by, and they've told me the same in the past. So don't feel like you won't get it.. because most likely , even more than most like you will.