Loblaw does not disclose the precise split of revenue between food, pharmacy, and general merchandise; but estimates and disclosures point to a significant level (potentially up to half at certain banners like Shoppers) of revenue coming from discretionary/aspirational segments.
The Metro 2024 annual report repeatedly emphasizes that the dominant majority of revenues come from food retail, with pharmacy and OTC forming a smaller, but growing, subset.
So while we do not have actual numbers, MRU is likely more 'defensive' like if one is looking at consumer defensive stocks.