Are there any reasons why you would want to wait for the 90 or 180 days? Suggest to apply as soon as you can get your official transcript.
As per this link, the 90 days is for restoring your status:
https://www.canada.ca/en/immigratio...study-canada/work/after-graduation/apply.html
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If your study permit expires before you apply
If you don’t change your status to visitor and your study permit expires, you have
up to 90 days after your study permit expires to apply for a PGWP and restore your status as a student.
To restore your status as a student, you must
- apply online for your PGWP and pay the correct fee ($255) and
- pay the fee to restore your status as a student ($350)
You can’t work until your study permit and work permit have been approved.
If you don’t apply within the 90 days, or if the 90 days have already passed, you must leave Canada.
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While this link says you have 180 days to apply for PGWP:
https://www.canada.ca/en/immigratio...-5580-applying-work-permit-student-guide.html
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May I apply for a post-graduation work permit?
You have
180 days after your school issues your final marks to apply for a post-graduation work permit (PGWP).
However, to be eligible, your study permit must have been valid within 180 days preceding your PGWP application.
You must also have:
- completed a study program:
- maintained full-time status as a student in Canada during each semester of your study program (except your final semester, which can be part-time, or if you took a leave from studies)
- graduated from a:
- public post-secondary school, such as a college, trade/technical school, university, or CEGEP (in Quebec), or
- private post-secondary school (in Quebec) that operates under the same rules as public schools in Quebec, or
- private secondary or post-secondary school (in Quebec) that offers qualifying programs of 900 hours or longer, that leads to a diplôme d’études professionnelles (DEP) or an attestation de spécialisation professionnelle (ASP), or
- Canadian private school that can award degrees under provincial law (for example, Associate, Bachelor’s, Master’s or Doctorate degree) but only if you’re enrolled in a study program that leads to a degree as authorized by the province
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