Pa'no ba masasabing ready na for potty training ang anak ko?

As I recall with our eldest son, we started his potty training nung time na we saw that he can already communicate with us, we started with signs lang and then we taught him anong sign gagawin nya then we would bring him to the bathroom remove his diapers then allow him to pee. Patience and trial and error pays a lot. At 2 years old hindi na sya nagdiaper.