I applied to 4 Canadian MSW programs last year with around 1000 hours and pretty solid grades and wasn't accepted. I talked to a few admissions people afterwards and they all said I didn't have enough experience. I know Carleton requires 3500 hours to apply, and usually the average applicant is 2+ years out of their undergrad (meaning they likely have 2 years of experience).
If you think you've got the grades and the funds to apply, go for it. It's good experience to even apply, the applications are a lot of work, but it'll make it less stressful for when/if you apply in upcoming years.