I thought usually what happens is that they do the eligibility check first and it will say next step is to conduct a background check. Then when eligibility check is done, the background check goes into progress. However, ours has been saying background check is in progress for 3 months, so I thought they had made a mistake. But when I asked what this means, someone in the February 2017 thread told me they heard that they recently started processing the background check in Mississauga before it gets to the VO. I am kinda confused as to what is really going on, that's why I am going to order the notes. But I think I will give it another month, as it's only been a few weeks since they started processing in Mexico. That way, it should show something in the background check after 2 months, I hope, in case they really didn't do anything in Mississauga.
I also don't understand when they send out the AOR2. It seems that you got the "we are processing your app" message around the same time as me but you haven't got the AOR2 email yet. Someone else said it took them 2 months to get that same AOR2 email, so it's a good thing you checked your eCAS. Maybe it depends on what officer is processing your app.