One of my 5.5-6 week old babies weighs 208 grams... but she's abnormally large.
I don't think your squirrel looks
significantly older than the two of mine whose tails are bushy (the other two are the same age but their tails haven't bushed out yet). Maybe a couple weeks, but I don't know if he's 10 weeks yet
I think once they get to a certain size, it's hard to tell by pictures. Is your little guy sitting on his hind legs steadily and grasping food well? Is he jumping and climbing with ease? If he's still weak, he might not have gained his full strength.
Since we're supposed to feed by weight, a 200 gram squirrel should take around 10-15cc every feed, and a healthy little one at that age can easily go four or five hours between feedings, 4 or 5 feedings a day. I think you could start ramping up the spacing between the feedings gradually over the next few days and then you'll probably notice he'll start eating more solids in between.
BTW, he's absolutely adorable!!