Citizenship

Hi everyone, so I've been reading a lot of the old topics about people passing their tests but not getting a decision, however, i dont see any updates on those people. So my husband went for his interview on 7/16/2019 and even though he got his green card through marriage with me we filed for n400 regular sine it was already 5 years that he had his GC. He went in and said the interview went great, the officer was really nice and he passed all parts of the test. The officer didnt look at his folder full of our marriage cert, selective service, etc but did ask for his social security card which was the only thing we didnt take, my husband said he didnt have it and she said ok even though the social number is written on his application. The office continued to go down the list of questions and asked my husband if he has ever been in removal proceedings and he said no but he was before marrying me and apologized for getting confused and explained that his case was denied so he was put in removal proceedings but case got dismissed once we got married. The officer said ok and continued. My husband said he signed all the paper work and signed the back of his passport photo and the interview took no more than 15 minutes. He got out smiling and said that the officer said congratulations you passed the test and we will send you a letter if we need anything else if not you will get the ceremony letter. When he got out i looked at his paper and it said he passed and had the boxes checked USCIS will send you a letter about their decision and a decision can not be made yet. She didn't say anything about a supervisor needing to look at his application for approval or anything. This was the downtown fields office in Los Angeles. Anyone had this issue and how long did it take to get the ceremony letter? Can his removal proceedings be an issue even though it was dismissed? Thanks in advanced.