I think your run looks great. I would definitely add some wood chips though, but no rush. With all the plastic around it, the pine will stay dry enough that it won't mat down too badly. It won't truly compost either, it needs moisture for that. You say it doesn't smell though, and that is really the whole point, so, I'd say you're doing great! Happy Thanksgiving! Isn't this rain a blessing? I'm so thankful for that today.