Finally got someone on the phone who was willing to help.  Apparently my rewards should be posted in the next 24 to 48 hours, so hopefully that is the case.
It's been almost 2 months since I placed my first of four orders with Dell, and so far none of them have shown up in my Dell Rewards, either as pending or available. I have called support several times, but keep getting told to wait 45 business days and they will magically show up. Having spent over $5k, I expect a bit better service than this.
Still no Dell Rewards