Are now finished (ēdē tetelestai). Perfect passive indicative of teleō. See same form in Joh 19:30. As in Joh 13:1, where Jesus is fully conscious (knowing, eidōs) of the meaning of his atoning death.
Might be accomplished (teleiōthēi). First aorist passive subjunctive of teleioō rather than the usual plērōthēi (Joh 19:24) with hina. John sees the thirst of Jesus in Psa 69:21. Jesus, of course, did not make the outcry in any mechanical way. Thirst is one of the severest agonies of crucifixion. For the “perfecting” of the Messiah by physical suffering see Heb 2:10; Heb 5:7.