How do you know that and what consequences do the builders have to expect in your opinion? On the websites I read that the model house exhibitions are closed and the consultation meetings take place via video chat. Since we are not yet concretely in the construction phase, I have no further information.
Ask your builder on Monday, then you will know for sure. I bet he won't tell you anything serious. First, the current construction sites will be completed, then the rest will come. The problem is that when one building project stalls, usually everything stalls. My friend works in construction and took 14 days off sick, after that he is taking vacation. His child has a heart condition, he is afraid. He says about 30% of colleagues are also at home. I don't want to cause panic but he won't be an isolated case. It's like playing dominoes. Eventually, more stones will fall.