They should start comming back soon .... mine started about two weeks ago here in Austin Texas

Yep, you should see some sprouts by now. I've got two and one of em is almost 5 ft.

How warm is the soil? Take a black plastic garbage bag. Cut an X in the middle so the stump will poke through. Fold the pointed corners under the edges. Use bricks on each corner to hold down the plastic. The sun will warm the soil under the plastic and encourage growth. I have friends in Tenafly and Red Bank. It seems y'all are always about 6-8 weeks behind Alabama in Spring weather, so you may just now begin to see sprouts. Good luck.