What does jem expect the verdict to be? Does Atticus think the same?

I think that both Atticus and Jem thought they had a good chance at a not guilty verdict. Atticus more than proved without a shadow of a doubt that Tom Robinson was innocent of the charges. Atticus also illuminated what the town probably knew already: it was Bob Ewell that raped and beat his own daughter. Unfortunately the power of bigotry was stronger than the power of the truth.