Good for you for working on this so early. This will make a huge difference to him in the coming years. My 2e boy was a great guesser and teachers didn't believe he couldn't read until 2nd grade, when I finally had him privately tested. I wish I would have been as proactive and insistent as you.
We hired a tutor 2x week for 2nd, 3rd and 4th grades (Wilson method). And his reading is about 75th percentile now, in 6th grade. It started about about 10th pct in 2nd. He's not afraid to read out loud and it's not an issue for him at all. So I'm sure your son will do just as well if not better.
