From what I was able to find online, it's no worry about detailing a brand new car. As mentioned above, it's non-factory repaints that you have to be careful with. Different paints, curing processes, etc...
I also just got a new car, built/assembled a few days before I had it in my garage. Detailed it the following week (correction to remove dealer-installed swirls/blemishes, ceramic sealant, etc...).