US Immigration from Central African Republic

I filed for my fianc to come to us on k1 visa I recently found out I was still married after 20 years I am now getting this resolved. My application started December 28th for k1 fianc visa I contacted immigration they told me I need to wait to see if application is denied or they ask for records of divorce. Has anyone had experience with what might happen I do have appointment with immigration just to ask. Do you think as long as I get the divorce paper before the three to 5 months processing time this will be ok or will I have to start over