No, were questioning your peculiar use od Jude and 1 Tim!
According to your logic, by these verses, the epistles of Jude and 1 Tim themselves are not part of the “faith that was once for all delivered to the saints” as the letters, as of their writing, hadn’t been delivered to the saints, and probably didn’t circulate through all the church for years afterward.
Further, the consensus of NT dating has the Gospel of John, John’s Epistles, and Revelation being written after Jude.
Further, neither Jude nor 1 Tim mention the mode of delivery, but we know it wasn’t all written, or all oral.
Bottom line, yes, a faith was once for all delivered, but the belief of a closed canon is not supported by Scripture, but by Tradition.