Thank you for posting your conversation with the USCIS officer. It feels good to hear something very relevant and realistic rather than simply waiting and waiting and reading speculation and rumors from various posts on this site that turn out to be false.
I have just crossed the 4-month waiting mark, and I'm expecting my fiancee's visa will surpass the 5-month mark next month. But I would like to know one thing. How did you reach a USCIS officer on the phone? Which numbers did you dial in their automated system to reach an actual person? Your information is much appreciated.