I would order GCMS notes within 2-3 months of when Mississauga receives your application. I initially ordered notes because I never got the Schedule A request on GCKEY and panic mode set in, but according to the notes they sent the request;
The GCMS notes indicated all the times I called the call centre and stated I never received the schedule A request. A Call centre agent actually sent out a note to the Officer indicting I never received the request; but I ended up mailing out the Schedule A and saw that it was attached.
Now I'm on the second set of GCMS notes, they help me psychologically because this spousal sponsorship is a long, brutal process and months of waiting to begin my life with my husband is very hard but the notes help me see that they are working on my file and I'm not forgotten.