Folks, don't worry too much if your background check status is not changed in the MYCIC account. There is a different team that is responsible for updating the profiles with the changes. I was told by IRCC that the responsible team has a lot of backlog of work and therefore they lag quite a bit.
Alternatively you can either find out about your status through regular GCMS notes inquires or if you get lucky to get to know it by asking the call center agent. Also, your local MP office can ask the status on your behalf if the call center agent won't tell you directly.
I think at around the 10-11 months time frame, they start the security check. They seem to be assuming a 3 to 6 months time frame for this stage for most cases. Some cases may take longer if more checks are required.
What I said above is based on speculations and can be wrong. Take it with a grain of salt.