Nappy Free?

What age it is for kids to be fully nappy free? Been thinking of starting my Olin to become diaper free since she can actually talk now, she can express how she feels and what she wants to do. A few days ago she was able to tell me that she wants to do number two and luckily, I was fast enough to bring her to the toilet, and voila! she actually pooped! But what I worry is her number one, how did you trained your kids to be say that they need to pee or poop?
Olin is 22 months old now, is it the right time already or too early?