Ma'am,

According to the Canadian government website about their new rules, taking effect at 12:01am on 28 FEB 2022, you will have 1 calendar day for Rapid Antigen testing for your return to Canada. The relevant text is below and a link is provided to the new rules for full details.

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Travellers will now have the option of using a COVID-19 rapid antigen test result (taken the day prior to their scheduled flight or arrival at the land border or marine port of entry) or a molecular test result (taken no more than 72 hours before their scheduled flight or arrival at the land border or marine port of entry) to meet pre-entry requirements. Taking a rapid antigen test at home is not sufficient to meet the pre-entry requirement – it must be authorized by the country in which it was purchased and must be administered by a laboratory, healthcare entity or telehealth service.
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Canadian new entry testing rules