If you’re an international student in Canada, you can apply for permanent residency through the Ontario Immigrant Nominee Program (OINP). Before you can apply directly to the OINP PhD Graduate stream, you must register an Expression Of Interest (EOI) first.
Thereafter, check that you have the necessary supporting documents which would have to validate the information you provided in your EOI. If you’re an eligible PhD graduate, you do not need a job offer to apply to the stream for permanent residency.