Most K-1s are processed at the California Service center (There are exceptions) If you get married, your then wife would be considered an immediate relative (This visa would be classed an IR-1/CR-1.) Your wife would get an IR-1 stamp at the Port of Entry if you had been married for 2 years at the time of her entry into the US. That means she would get a 10 year green card shortly after arrival. If you are married less than 2 years at the time of her entry in =to the US she would be stamped as a CR-1, which is a 2 year conditional green card. 90 days before her 2 year expiry date, you both would have to file for removal of conditions, which if approved would then have her issued the 10 year green card. The application to do the spousal visa (Form I-130) is currently taking approximately 15-18 months to be approved by USCIS and then it is sent to the Department of State's National Visa Center to gather required documents, visa application (DS-260) and the required fees before being sent to the embassy for the medical exam and interview process. That can take a 1 -3 months before being sent to the embassy.