If you go to Canada Post Website and track it, you will see they cannot find any info (well deh.. cuz they have not activated it). However, this doesn't help at all because you can't set up any notice for that specific tracking number.. for some reason..
I installed the Canada Post App on my phone. You can put the tracking number in, and it will stay there even when it's not activated. Then, you will need to set up the notification inside the app to -push notification-, and you will get a notice right away when the tracking is activated. I didn't have to worry about going on the website and check it constantly.
Hope this is helpful