I got an sms with tracking idno. and written as decision envelope has been couriered from canada vac. I live in new delhi. I did not submit any return label.Your visa has been printed and within a day or two (could even take a week in some cases) passport will be shipped out. Return tracker activation is simply referring to "tracking information" for the return label you submitted along with passport and photos (which I hope you have). You can check it's status by using carrier's website. I had enabled updates to send through mobile application as well as email so if anything updates you'll get notified. Don't worry you are almost done with this process.
Congratulations!