Fruit is forming. There are droplets on the fruit that look like crystals.
Peach Tree Disease
Certified GKH Gardening Expert
If the droplets are kind of gummy in nature, it could be from peach borers, which can affect the fruit as well as the tree. Here is more information that will help determine if this is the problem and what you can do about it: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm