Yes, this is the standard

Cosmetic surgery is always paid up front usually 2 weeks before surgery. This prevents the patient after the fact telling the doctor they aren't happy and aren't going to pay even in the setting of a perfectly good outcome. It also protects the surgery schedule as there will be stiff penalties for cancelling within the last 2 weeks before suregry when it will not be easy for the doctor to replace your spot on the schedule with another patient. For reasonable situations, you may be allowed to postpone and reschedule your surgery without a penalty. Check carefully the financial contract you signed with the doctor's office.