He's beginning to connect the sensation to the activity, which is a step forward, but not the same thing as being able to recognize an urge before peeing. (And he may find the feel of the potty seat a bit unpleasant / cold / bizarre at this point – let him experiment casually with that at his own speed, and he'lll get used to it.)
Lots of parents start to "train" their kids starting as early as 18 months, but very few actually end up with kids who recognize an urge, leave their activity, and get to the potty in time. Basically, the parents train themselves to get the child to the potty regularly. Frequently that backfires, and pottying becomes a source of contention and resistance, actually slowing final success.
When the child is truly ready, he'll take the initiative to act on sensations that are clear long enough in advance. This is a natural stage of development, and just as walking and talking become desirable when the child is ready, he will essentially train himself (with your support teaching the details) in a short time. My daughter did this at about 2.5 years, and it took less than a week. Ditto my grandson – completely trained at a slightly later age in only a couple of weeks, with accidents diminishing by the day.
It sounds like you're doing helpful and positive "pre-training." This is great, and will help your little guy want to do that interesting activity that the big people do. WHEN he sorts out the sensations, and finds it in himself to commit to the obligation. There are also plenty of books and some videos that can help him have positive feelings about the whole affair. My grandson responds well to play acting, sometimes using his toys as puppets to explore ideas and concepts.