This is a question for your surgeon. It might make it more difficult, depending if the tumor is at or near the back of the prostate where the nerves are.
Since you're worried, contact the department. You may be able to defer it a bit if necessary for you to find out your situation and decide what you want to do. They can often pull someone else back into your slot given enough notice, so ask how long you'd need to wait if you deferred it.