I would be blown away if he wasnt ready by the WJC. It's one of the main reasons he came back.
In saying that though, you'd think the WJC coaches would like to see him play prior to the tourney. I've read that Motzko wanted to make sure Keller got in a few games prior to the tourney (sounds like Keller may play tonight). I bet we see Boeser on Saturday night. If we don't this injury is probably worse than a lot of us thought.