Thank you! I hope things will go well for you. Honestly, 2 business days is a little tight... it's a gamble as you never know if the embassy has any backlogs to clear.
I remember getting the status update on ustravel docs after I left my office around 6pm. I was checking it every couple of hours. Which led me to believe that the embassy probably sends the passport for visa printing at the end of the day as a batch.
You can also track your case here https://ceac.state.gov/CEACStatTracker/Status.aspx
When your visa is printed, the status will show as "Issued"
The interview was very informal for me. Kinda like catching up with a friend. In the room, there were 8 counters and I think family based visas were served by counters 7 and 8. We were able to sit and wait instead of being in a queue. When the officer was ready, they will call out your name. My spouse wasn't required to be there. The questions were simple, asking about when and how we met, what were our jobs, where and when did we get married, if we have kids, what I'd want to do in the US, where I'd live.
Counters 1-6 were for travel/business/student visas from what I observed. They had to queue up, go to counter 1, then counter 2, before getting interviewed at counter 3-6. I dont know what they asked for at counters 1 and 2, but I imagine they were checking documents.
It was a little strange during the interview to be spilling personal details or plans with so many strangers behind you. There's a glass barrier between you and the officer, so people were speaking loud enough for the officer to hear. It was also loud enough for me to hear all about some of the applicant's travel plans, visa type, family details.
I think if you're honest and concise, you'll both will be fine. Arrive early as there is a initial check outside the embassy regarding your interview appointment. And you'll also have to go through security where they took my phone, portable charger, and earphones.