Hey, dialabrain. Thanks for your reply.
The following was the link I was reading and while I could read it to say that these two displays are in addition to the build-in display, the word "and" is not on this page: Connect multiple displays to your iMac Pro - Apple Support
When I'm looking to drop way more than $5K on a computer, I would rather not make assumptions about what it will and will not be able to do. Instead of saying:
Two 5K displays with resolutions of 5120x2880 at 60Hz
I would have been much more comfortable if it had said:
Two external 5K displays can be added to the built-in display, all with resolutions of 5120x2880 at 60Hz and support for one billion colors