I have a question about my 22 month old son.?

I have been giving him puree foods for a very long time. Just about a month ago I have been trying to teach him to chew foods because what he used to do is put it in his mouth and swallow. So about a week ago he was eating thoses gerber melts in your mouth puffs. He has been feeding it himself and eating it. Now I am not sure if he is chewing it but he's eating it. 2 days ago he was eating those puffs cheetoes. He was biting into it and eating it. Again I am not sure if he is chewing. What should I do next? Do you think that that's it, he has learned to chew?