When to mention im Canadian in networking/interview?

Hey guys, I need some advice.

I'm a Canadian in the USA, been here for university the last few years.

I'm graduating in December with double bachelors in finance and economics and I'll have done 3 finance/banking internships after this summer.

My ambition is to stay in the USA and do IBD or something similar. What this would entail is that I can work without a Visa on whats called "OPT" for one year and then after that I would need to get sponsored to get a work Visa.

When should i mention about the OPT and the need for a Visa in the future? Should I not mention it at all when networking? Should I wait to mention it until an interview?

ANY input from anyone international or domestic would be greatly appreciated, I'm just trying to maximize my chances here. Of course, I'll be applying to Canadian firms as backup as well.

Thanks alot!