The regulatory deadline for mailing proxy materials to security holders is at least 21 days before the Meeting Date [Required by all statutes]. If material is mailed to registered security holders using Notice and Access [as marked by PTK], National Instrument 51-102 states that the notice and proxy must be mailed a minimum of 30 days before the Meeting Date.
https://www.computershare.com/ca/en/eguide-planning-mailing-date