I arrived July 4 and already have 90 day Non O retirement visa. I can get 12 month extension on Sept. 9 or later but am concerned about 90 day reporting because I don't want any more extra trips to CW. I have read here that first report must be done in person but on Immigration website it states :The first application for extension of stay by the foreigner is equivalent to the notification of staying in the Kingdom over 90 days. Does my extension qualify ?  If necessary I could wait till Sept. 19 and get extension and 90 day reporting done on same day. 

You extension application will be equal to doing a 90 day report.

Your first 90 day report after that will be 90 days from the day you apply for the extension.