You earn you degree once your last courses end. So if there’s a summer term, you’ll have competed the requirements for the degree at that point and can say so on jobs. Your transcript will reflect this.

However if you are talking about the ceremony, most schools don’t have a ceremony at the end of summer and will have these students choose to walk in the December ceremony (if one exists) or the bigger may ceremony. Or choose not to walk at all.

The specific details are going to vary from university to university though.