Woody, I'm assuming that you ordered it directly from Apple. What model did you get? And what is the processor speed?
It's unfortunate that you have to wait until late August to receive it. After reading your post, I browsed the Bestbuy web page and I'm flabbergasted that they have nothing available for 27-inch iMacs until at least August 21. Some models are listed as available only later than that. Wow!
If you get an external hard drive with FW3/USB-C connections, it should also help to speed your work up substantially. I look forward to your reviews after it arrives.
WM
Base model, with the 3.0GHz 6‑core Intel Core i5 (Turbo Boost up to 4.1GHz), which is plenty good enough for my needs. The Radeon Pro 570X with 4GB of GDDR5 memory should be plenty to run the software I'll be using. (No gaming for me.) I also wish it was coming sooner, but between shipping delays, COVID and trade wars, things have slowed down a lot. I guess there are a number of people buying up the 27" models right now because they fear the new iMac models may not be user upgradable for RAM.