Thanks to everyone for the replies.
Today was a legal holiday in Canada.
I will see tmw whether there's any change in ENterprise's, their insurer's, or their claims service having started a claim.
So far, since last week, none have responded to me or GEICO.

to Chemystery:
Enterprise Montreal shows in the "Cross Border Policy" tab:Travel to the United States is limited to renters 25 years of age or older.