I'm in the same situation. My AOR2 was July 17, they did ask for some additional documents from me about a month ago though.I'm a April 7th Applicant; AOR2 June 19th NDVO; my GCKEY has been we do not need additional documents for about a month now and for background check it is: Your application is in progress. We will send you a message when we start your background check.
Last update according to my GCMS Notes was on July 20th and the Application Assignment due date was August 19, 2017.