The ultimate result of the coming forth of the Book of Mormon is that the words of Jehovah to the Jews and the word of Jehovah to the New World remnant of the Jews will come together to make all of Jehovah’s gospel known. Verse 17 speaks of having all revealed, no works of darkness, and nothing sealed. Each of those phrases is intended to invoke passages from Isaiah which Nephi has quoted and used in the context of his prophecy of the future.
Nephi ends his chapter with “and now, my believed brethren, I make an end of my sayings.” This ends his prophecy, but Nephi will continue to have things to say about the Messiah in his next chapter.