"Passport application form has been submitted" meaning that you have submitted your form but embassy hasn't received your application yet. I believe it would be helpful to check on BLS website in that case. You can also check your Purolator PIN to make sure whether Purolator has delivered your envelope correctly which I don't think should be a problem (only for postal application btw)
If you go on the website:
https://www.blsindia-canada.com/trackapp.php , you will be able to track your BLS passport renewal application. Select your submission type (walk-in/postal), select 'Passport Application' in application type, enter your ARN, passport number and CAPTCHA (random code of 6 characters/digit/special characters) and hit Track Application.