Best to speak with a good Tax Preparer, like H&R Block Executive Tax services.

In general, if you're in the US you pay tax on all your income.

Then since Canada is an OECD (tax treaty nation), you also file your Canadian tax forms + pay any tax difference.

In other words, you won't pay tax twice.

Multi-jurisdictional taxes are tricky. Talk with a preparer + have them do your taxes.