1. Fat transplants will partially absorb for 3 months.
2. At that point, fine cannula liposuction may reduce your cheeks.
3. If the fat is in muscle, it may need surgery to remove.
It is most certainly wise to wait at least three months, if not six months to year , after your surgery to assess the result. The fat may or may not entirely persist in the cheeks and the changes you see in the cheeks could be due to a combination of the fat and the other two procedures that were done. The fat theoretically could be removed with liposuction or more precisely with an open procedure. It is unlikely that you will need this done.
During this waiting time be sure not to gain weight. Sometimes losing weight will cause fat to shrink.
I would agree that waiting several months is a good idea because some of what you see may be swelling and some of the fat may also not take and resorb.