Just a note, once your PD becomes current, you'll be put in the queue for a visa interview. Here's the unfortunate kicker wrt the US consulate in Accra. Currently, for immediate relatives of USC citizens, the wait time for interviews after DQ is 17+ months. So, if current trends continue and you being in a preference category, my guestimation is, it will take you 2+ years to get an interview date, and during this period also hope your PD does not retrogress. Good luck.