Agreed, especially because if he begins having a sticky spot where he doesn’t get a concept you’ll know if he’s reading aloud to you. That’s when you could start the word formation lessons again focusing in on what he needs help with.
My 11yo hit fluency around 6.5, her 8yo brother is nearly there, able to do simple chapter books slowly, 7yo is reading fluently now, and 5yo hit fluency at age 3.5 with nothing from me. No joke, he’s better at reading than the current 8 and 7 year olds. The younger three boys don’t even have reading on their radar, which suits me just fine.