Yes, thats typical. Those who preorder on the first day or two get their cameras, but when demand is higher than expected, latecomers will have to wait for the 2nd or 3rd shipment. Stocking stores in countries around the world takes a huge number of cameras, and the factory plans a production rate based on sales forecasts. Its just impossible to make enough initially when a product popularity exceeds predictions.
The Coronavirus may indeed be affecting production, I'll bet Canon is scrambling to get components, and is having to pay more for them than expected. It may get worse. If I wanted the MK III, I'd order one immediately, because they may be very hard to get later. Unfortunately, my wrists can no longer take the weight.