I have a Cherimoya tree in Maryland
This is a tropical plant and cannot overwinter outdoors in Maryland. This tree is hardy to Zone 9. You will have to bring the plant indoors and keep in a bright location. The tree will most likely never produce fruit. If you are would like a tree that produces a fruit similar in taste, consider the pawpaw.
Here is more information o the cherimoya https://www.hort.purdue.edu/newcrop/morton/cherimoya.html