TN Visa holder that is sponsered by Canadian Company

Hi,
I am working for a Canadian company. My wife got an offer for a 1 year research position in USA (she has a J1 visa). My company got me an TN visa (since she is doing business in US) to accomadate my familiy situation. I am working from our temporary home from USA (California) remotely back to Canada.

I am still getting paid in Canadian dollars (no change in my benefits and payroll). I spent most of my time here in USA and rarely travel back to my office in Canada. (I already spent more than 183 days in USA)

My question is do I need to pay federal and state (California) taxes on my Canadian income or can I avoid paying taxes in USA based on the USA-Canada tax treaty?

Thanks