I'd wait a week to send them - nothing is open over there, esp. in the NY/NJ area, so things are just going to sit somewhere anyway. Less chance of them getting lost if you wait until the Post Office is delivering again.
Also, chances are good that your customers aren't even home, or if they are, are out of power and not thinking about their Etsy orders. I don't think anyone will be upset if you pause on your order sending while this plays out. You can try emailing them, but remember that 4 million + people are out of power on the East Coast so... no email either.