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As long as it is green below the bark, it will leaf out. I would give it a little additional time.

There are two ways to grow peaches from the seed or pit. First, collect peach pits during summer and sow them directly in the ground in fall about 4 inches deep. Add some mulch to the planting area. It should sprout in the spring. Alternatively, you can place the seed in a small pot about three months before the last frost date in your area. Dampen the soil and cover with a plastic bag. Place it in the refrigerator until threat of frost has passed. Take the pot out of the bag and place in a warm, sunny window keeping the soil moist. Transplant outdoors in spring.

Other than wilting, is there any other symptom? Wilting alone can indicate many different things. Peach Verticillium wilt generally affects only one side of the tree and may display discoloration. Peach tree borer can also affect these fruit trees. For more information on these pests, here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm

Late winter or early spring is the best time to prune peach trees like this.

While it is watered twice a week, it may not be enough. make sure that you are watering 2" on the entire root system. Typically the root system will spread out at least as far as the canopy does.

If this is a tree that has been planted in the past year, than it will need significantly more water than an established tree.

Try increasing the water and also check the roots to make sure that the roots are healthy and that there is nothing preventing the roots from taking water up.