I had my document intake about 8:30AM then they called my number for fingerprints intake about 15 minutes later. Then I waited again until they call my number for interview. I had my interview about 10:45AM. The VO asked some questions such as how did you meet your husband? have you been to US before? etc. At the end, the VO said congratulations! my visa is approved then gave me approval letter and instructions on how to pay the $165 online before entering the states. I left the U.S. Consulate Guangzhou afterward. Hope your wife interview will go well!