When rescheduled, the sedar document shows YES for “notice and access”, which means they are required to give 30 days notice rather than 21.  So, on or before Wednesday Aug 21.  Seems to me, a week from this Monday would be a good day for an announcement.

Regulatory Requirement:

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, 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