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He is in coma. The time to recovery will be longer and we cannot predict that now. As he is in coma, he can only feel the pain and not touch. Also, he will not be able to react much while in coma.
While in coma, the patient will be unconscious ans so he cannot speak. Moreover, since the injury is on the left side, the speech areas in the brain may be affected.
Some injuries like fracture and EDH (epidural hematoma) occur on the same side. Some like SDH (subdural hematoma) and contusion occur on the opposite side. Since you have mentioned it as SDH and contusion, it would have happened on the opposite side.