This is something you should discuss with the Doctor ,it may be cleared up a lot in 2 days ..Its not really possible to know , it may depend on if he has a fever or if its allergies .Let us know what they decide , good Luck
Have you already had the pre op drs. visit to check on health prior to surgery? Usually they schedule those right before the surgery. They will not put any child (or adult) under anethesia with symptoms you describe. But your doctor will make that call.
So, give the doctor a call yourself and tell him the symptoms your child is having. good luck