The bishops do very little. They just preside and the priest-celebrant celebrates Mass in his stead. The bishop is censed in the places in the Mass where he is supoosed to, the incense is brought to him for it to be blessed, as is the water cruet during Communion preparation. Whoever is supposed to read the Gospel (priest or deacon) goes to him for a blessing, prior to chanting it. No Byzantine prayers are added to this service.