Activating your work permit will depend on where and how you submitted your application.
Activating the work permit after applying from within Canada
If your application is approved after you submitted it from within Canada, you will receive an approval letter from IRCC. For online applications, the approval letter will be available in your online account. If you applied on paper, the letter will be sent to your mailing address. Once you receive the approval letter, your physical work permit will be mailed to you, already activated, and you can use it to work in Canada.
Activating the work permit after applying from outside Canada
If your application is approved after you submitted it from outside Canada, you will receive a letter with instructions on how to obtain your physical work permit at a Canadian port of entry (POE). For online applications, the instructions will be available in your online account. For paper applications, the letter will be sent to your mailing address.
Activating the work permit after applying at the port of entry
Some applicants may apply for their work permit at the port of entry in Canada. If you apply at the border, you will need to provide documents proving your eligibility. If your application is approved, the officer can print your work permit immediately at the border, and you can start using it right away.