I can assure you that Sim-Free iPhone XR will be out 1 month after it's initial release. Apple did the same thing last year, Sim-free model for the iPhone 8 and iPhone 8 Plus was available at pre-order. As for the iPhone X, Sim-free model was not available right at pre-order and was made available on 12/3/17 (Initial launch was 11/3/17).
Correct. But since OP mentioned about it. I assumed that OP wanted to buy it in U.S. So I responded on that perspective. But yes other countries will have them available on day 1.In the US that’s probably true. But in the U.K. (maybe other countries too) it’s SIM- free at initial release.