This basically repeats the same idea for emphasis. The verb from the first phrase may be supplied for the second. AT: "I announce the end from the beginning, and I announce beforehand what has not yet happened" (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-ellipsis]])
Yahweh speaks of Cyrus as if he were "a bird of prey." As a bird swiftly captures its prey, so Cyrus will swiftly accomplish Yahweh's purpose to conquer the nations. (See: [[rc://en/ta/man/translate/figs-metaphor]])