Nothing is wrong with it. You order it, they build it. Plus it has to ship from China to your door. That takes a few days as well. 10-14 days is completely reasonable for a custom build high-end machine. Plus, Apple always under-promises and over-delivers. You'll likely get it sooner that what they quote.
If ordered from Apple this is generally the case. However Apple's quoted replacement time for a CTO iMac Pro is 30 days. I have discussed this with them many times at various levels within the company. Neither Apple nor their retail stores stock any CTO iMac Pros.
However some retailers such as B&H stock many high-end CTO iMac Pros. These are available rapidly, often shipping same day.
The problem is B&H, Adorama, etc. do not accept returns on computers -- including desktop Macs. If it totally fails after receipt, malfunctions in some way short of total failure, fails a workflow test or for any legitimate reason it doesn't work in your environment -- you can't return it.
In a professional support situation, this is a major problem for Apple. If your CTO iMac Pro fails and they can't fix it, you are facing up to one month of downtime while a new one is built. If you buy it from B&H and it fails shortly afterward, B&H could theoretically ship you one the next day but their policy is they don't accept returns on computers -- including iMac Pros, Mac Pros and I assume the future modular Mac Pro.
So Apple doesn't have CTO replacements, and B&H and Adorama have them but won't accept a return and ship a replacement.
The Apple Business Team and Joint Venture teams are powerless to help in cases like this. They do not have access to extra or expedited CTO iMac Pros.
Unless this situation is changed, it will be worse next year when Apple ships the modular Mac Pro. A business using the machine could be facing a one month downtime to get it replaced.