The last Pope will be Jesus Christ when He returns.
Peter the Roman may indicate that - a full circle from the beginnings of the Church. That is, if we believe the prophecy to be true.
That's not technically correct; the Pope makes no claim to be Christ. The applicable title is "Vicar of Christ" -- it would be sort of silly for Christ to be His own vicar.
But substinatively, of course, you're right. But technically, Christ is already the groom of the Church and the Head of the Body.