I did not get approved on the spot but rather later that night. The officer kept dropping hints through the interview such as "once you get your greencard make sure you go get condition removed from ssn card" so I knew even though she didn't approve on the spot that I was going to get it.

She asked basic questions about how we met how we got married and then she asked individual questions about each other such as out employment and would tick of things on paper as we answered. The interview took place with myself and my wife in same room the interview took about 10 minutes. We brought everything in the checklist they provide but only where asked for our marirge certificate, any recent bank statements since application, explanation on why we have a second property and proof of that property being used as a rental property. She also went through our wedding and honeymoon book but that's after I insisted she looked at it