I assume your husband has a loop ileostomy now? If that's the case then he still has his anus and a portion of his rectum left. There are two options. One, he can wait a year or more to complete the jpouch surgery (one more surgery most likely) or two, he can wait and have a permament ileostomy (removal of the rectal cuff and anus) at his convenience. Either way he will have to have more surgery but with either choice there's no rush. Many people wait to return to better health.
There's one of two scenarios:
1. He has a loop ileostomy and has his jpouch made but non-functioning. If this is the case the second surgery is quite simple, close the ileostomy and the pouch starts working.
2. He has a loop ileo and had most but not all of his rectum removed, but the pouch is not made yet. If this is the case the second surgery is a bit more complicated.
Best to find out from his surgeon where he exactly stands.
A loop ileostomy is intended to be temporary so they are typically harder to manage. Picture a garden hose cut halfway through with one part sticking out of the abdomen (the ostomy) and the other part (not functioning) but hanging in the abdomen. Because a loop ostomy is not flush with the abdomen there can be more skin problems. Also they are higher up on the waist line than a permanent ostomy which means transit time is quicker and stool is looser.