On Prophecies Related to the Time-Table of the Messiah's Coming

According to the following excerpt from the "Called to the Faith" sermon of St. John Vianney, > The theologians [at Jerusalem] told them [the Wise men] the prophecies announced that > the Messiah would be born in Bethlehem, and that the time had come. I know that the prophecy in Daniel ch. 9 indicates that the Messiah would be *cut down* before the destruction of the Temple---and so, must have already been on earth prior to 70 A.D. However, I ask--- Which prophecy[ies] might suggest, more specifically, that "the time had come" for the Messiah to be born? The where portion (i.e., Bethlehem) is nevertheless, clear to me.