Most states are not anywhere near the level of New York, and while they need a shelter-in-place order eventually, we need to recognize that practically, people can only stand them for X amount of weeks. If you do it too early you risk people flouting the order and continuing to do so once things get bad.
The US is more akin to the European Union than a single country, and it's high time people realized this and stopped looking to uncle sam for leadership. During the 1918 flu pandemic, there was no national response. Individual governors and mayors instituted lockdowns as they saw fit, with support from the feds in terms of money.