After the American immigrant I730 passed the interview,

There should be no problem in passing the interview. You'd better wait for the call from the embassy. The review time is usually 2-4 months. Isn't your time very long? No notice will be given for half a year. In short, as long as the interview is successful, there will be no other problems.

As for the package, the time for each person in the whole family to come out may be different, and it may take several trips to the embassy, hehe. The parcel can't be mailed or picked up, so you can only go to the embassy to pick it up yourself.