The circuit court has jurisdiction under this Chapter over persons not charged with a felony who meet the standard for judicial admission. Inmates of penal institutions shall not be considered as charged with a felony within the meaning of this Chapter. Court proceedings under Article VI of this Chapter may be instituted as to any such inmate at any time within 90 days prior to discharge of such inmate by expiration of sentence or otherwise, and if such inmate is found to meet the standard for judicial admission, the order of the court ordering hospitalization or other disposition shall become effective at the time of discharge of the inmate from penal custody.