There is a chance that the breast that had a surgery won't produce that much, as long as the scalpel cut through the milk ducts area, it depends on surgeon, where they do an incision.
Even if you experience lower milk in that breast, you can still produce enough with the other one. Women with twins are perfectly capable to satisfy their hunger nursing exclusively. I, personally, nursed my 18 month old with one breast only and she was always at the top of the charts. So, yes, this is absolutely possible.
Regarding your breast size, it is supposed to go back to normal after you are done with nursing.