I was just up from NOC and the Sassfras (new shelter) stayed empty all night. I and 4 others camped up on the ridge. About 8 others hiked up to the bald. The shleter was empty. I understand that Brown Shelter just past there had plenty of room as it is a very big shelter.
Not sure about the Wesser shelter but it has a big over hang if the shelter is crowded.
FYI: It is always a good idea to carry some type of shelter. However, that was not your question. You should probably be alright at this point in time. MOst hikers are going from Wayah to Wesser(NOC) in one shot. Some will stay in one of the 3 shelters (Cold Springs/Wesser/Rufus Morgan) before there, therefor spreading out the herd. Then when they leave NOC they either camp on the bald or head for Brown Fork Shelter which is large and then straight to Fontana.
Hammock Hanger