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.
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.