Who is the modern day prophet?
The Catechism of the Catholic Church sufficiently describes the prophetic office of the Church "when it unfailingly adheres to this faith ... and when it deepens its understanding and becomes Christ's witness in the midst of this world." (CCC no. 785)
The first point in a prophet implies an ontological reality: we are the faithful followers of Christ before anything else.
The second point implies what we should be doing as prophets in process - we should be deepening our understanding of the faith.
The third connotes every action we should be doing in this world: to be Christ's witnesses in the midst of this world. Let us stand up to the truth of Christ and be his instruments of salvation for others.