See my thread in this forum about my long saga waiting for my Amex Platinum card to 1) accurately reflect my spend, and 2) for Delta to acknowledge the spend and upgrade me to FO based on reaching the waiver threshold.
Long story short -- there is a significant delay between the actual spend and when Delta.com will reflect your MQD waiver. In my case, it was about 2.5 months, and there's not much you can do about it (I called both Amex and DL multiple times).