I would start now if you haven't already. I had a potty in my daughter's bathroom being shortly after she turned 1. She was completely potty trained by 2 1/2 years old. She did a great job. I was not pushy about it. We did not do the tangible reward system - just got super excited anytime she used/showed interest in/sat on or did anything with the potty. Happy potty training!!
Every kid is different and boys and girls differ. I didn't even start my boy until he as about to turn 3. As a result it took less than a month to train. Some people start early and end up potty training for 6+ months or even over a year!