I earned US revenue in 2022 as self-employment, what exchange rate can I use to convert revenue in Cdn dollar? Can I use avg US-CDN by BOC?

E.g. Jan 5 2022 US$2000, Mar 3 2022 US$1000, Jun 6 2022 US$1000 (total US$4000). Can I use an average 1.3013 average exchange rate published by BOC to convert into Canadian dollar or I have to use a specific exchange rate for that date to convert into Canadian dollar revenue?