Potty training

Okay, my son is 18 months. I don't think he's ready yet but how do you know?

Whenever he's naked except a diaper he has a habit of trying to pull down the front. And when the diaper is off he's practically ripping his penis off. He smacks at it and pulls. He did have a pretty harsh rash recently that needed prescription cream, and I think he was trying to itch but it's gone now.

And he does something new. When he is in the tub or really anywhere without a diaper on, it's like he knows when he needs to pee. He looks down and then it looks like he pushes to pee. AND I'm not entirely sure but it also seems like he knows how to start and stop the stream. I say this because he'll pee and then it stops and then he pees a little more. Obviously this is my first child so I don't really have a clue what is going on 🤣🤣.