M.,
I guess that depends on what you classify as "feeding himself." At 10 months, a child should be able to somewhat use a spoon to get food into his mouth and use a sippy cup some too. He should be able to grasp bit size foods and get them into his mouth also using a raking motion and by 12 months (approx.) be using his index and thumb (pincer grasp) to obtain bite size foods. By 15 months, he should be able to use a fork some and stab at foods. By 24 months, he should be using the spoon and fork with significant mastery of both along with a cup without a lid when being supervised. Hope these help.
But at 10 months, he should be trying to feed himself and you get to let him make a mess while trying to encourage him to grow. But remember, he still will need help feeding himself for awhile.
D.