Box 13 should show the amount of interest income earned from Canadian sources, not the currency code. I think you could check the information on your T5 against your bank statements/records to see if you have USD interest income and whether the amount is correct. If not, you would need to speak to your bank. If correct, then yes, you would need to convert the USD income to CAD using the Bank of Canada average exchanges rates for 2023, assuming your income is earned throughout the year.
