Q.Chinese pistache
Our Chinese pistache was planted in February. It is the beginning of May and starting to warm up. (Oklahoma). It reached low 90’s today. My question is…there are no leaves. Should I be seeing something at this point?

Review the planting information in the link below.
https://www.gardeningknowhow.com/ornamental/trees/chinese-pistache/growing-chinese-pistache-tree.htm
Verify the watering schedule, water is the most critical for establishing plantings. Until they are rooted in, they require more water than established plants.
Do the branches bend or snap off and break?
Try the bark scratch test.
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm
If you believe the tree has died, contact the garden center you purchased from, as most will replace a tree within the first year.