That leaves us with the full maturity of the saint in the eternal kingdom, presumably after death. I wouldn't rule out the possibility of another explanation, but I have yet to hear of one.
Our hope is the return of Christ and the rapture/resurrection at the return of Christ. I Corinthians 15 discusses the resurrection and the transformation of the saints that remain. It also mentions 'the end' τὸ τέλος when Christ delivers up the kingdom to God.