Q.WHEN DO THE LEAVES PUT OUT (MONTH)?
Tree has many dead limbs and here in late march no new leaves yet? Live in Middle Georgia, should they start budding?

Certified GKH Gardening Expert
Since I don't know what kind of tree you have, it's hard to give a specific answer about whether the tree should be pruned to get it to leaf out, etc. However, dead or damaged wood can be removed whenever you see it.
Here's an article that may help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-leafing-problems.htm