After delivering the shudder-worthy oracles in chapter 10, God turned Isaiah’s eyes to the much farther future of Messiah’s reign.
Having now established the supremacy of Christ, the writer turned his attention to those mysterious celestial beings, the angels.
Many see these next verses as the greatest prophecy of the future in the whole Bible, the fulfillment happening when Jesus comes to establish His millennium kingdom.
Prophets—and notably Peter—did not write their private opinions, they wrote what they were given by the Spirit of God.
The first layer of meaning is straightforward. Ripe fruit, when it is plucked from the tree, is cut off. For the harvester, the ripened fruit is a lovely blessing, but for the fruit itself, to be harvested means its time on the tree will come to an end.