How to activate your work permit after you have applied from Canada
If you are approved for a Canadian work permit after applying from Canada, IRCC will send you an approval letter. If you submitted your application online, it will be available in your account. If you applied on paper, the letter will arrive at your postal address. After you receive your letter of approval, your actual work permit will be mailed to you. You can work in Canada with the permit that you receive.
How to activate your work permit if you applied from outside Canada
You will receive an email with instructions for obtaining your work permit from the Canadian Port of Entry (POE) if your application was approved. If you applied online, your account will show the letter of instructions. If you submitted your application on paper, the letter would be sent to your postal address.
How to activate your work permit from the port of Entry
Certain applicants may qualify to apply for a permit to work at the Canadian port of entry. You will need to provide documents that prove your eligibility when applying for a permit at the border. The officer can print out the work permit at the border if it is approved. The work permit is immediately usable.