Probably not. I say that only because of name recognition and he hasn't started every game this year. But he does have a good shot at being Defensive Rookie of the Year, or so I would think.
It's probably too late in the year for Pro Bowl honors as that is voted very early. Patrick Willis is much more likely to grab those honors than Harris. However, with the tackle pace Harris is on, he's already 22nd in the league according to NFL.com and rising incredibly fast. It is viable that at the end of the year he could be the leading tackler in the NFL. Also, Harris is currently winning for Rookie of the Week on NFL.com.