The final doxology, "For the kingdom, the power and the glory are yours, now and forever," takes up again, by inclusion, the first three petitions to our Father: the glorification of his name, the coming of his reign, and the power of his saving will. But these prayers are now proclaimed as adoration and thanksgiving, as in the liturgy of heaven. The ruler of this world has mendaciously attributed to himself the three titles of kingship, power, and glory. Christ, the Lord, restores them to his Father and our Father, until he hands over the kingdom to him when the mystery of salvation will be brought to its completion and God will be all in all.
Source: Catechism of the Catholic Church (Vatican.va)