Note that the progress bar just shows the time elapsed from the day an application is submitted. It does not inform what stage or how far an application has been processed.
Once the
progress bar is at 100% then you may see a message in MyCIC like this; "Your application is taking us longer than usual to process. About 20% of our applications are more complex to process. They take us longer due to things like how easily we can verify information, how well and how quickly you answer our requests, and whether the application is complete."