The forum “Guide “
has the process step informations As well as the USCIS website , if you create you timeline you can also see similar timeline from others in your specific country, the USCIS is taking an average of 3 months to process the application, if no Request for Information then it is forwarded to the National Visa Center for creating the case number (upon issue of case number then form160 can be filled out) and setting up the consulate for the interview. Hoping this helps.