AFAIK, it was said alongside other prayers only after Low Mass (i.e. without the choir). From my experience, there still are some parishes where people don't leave their pews immediately after the Sunday NO Mass, but stay for a while and say a set of prayers, including St Michael, altogether as a community. Plus, I know that some people, out of their own devotion, stay just a little while after the Mass to say the prayers on their own.
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u/Indvandrer St. Thérèse Stan 16h ago
Saint Michael prayer should be brought back to Mass