@jifamily , did he live in Canada for all of 2023 or was he commuting everyday ?
If his tax home was in Canada, then he could avail himself of Foreign Earn ed In come Exclusion. In TurboTax, under personal income, choose "I will choose what I work on", choose "I do not have a W-2", continue, then from the list of income categories, near the bottom under other uncommon incomes, choose "Foreign Earned Income Exclusion". This will then walk you through filling out form 2555 and that is it.
If you need more on this , please feel welcome to add to this thread and I will come back and help.
