The timeline never changed for the apostles. As per Daniel's prophecy and many others in the Old Testament, their expectation and hope was that Israel would eventually repent nationally, the Tribulation would begin as per the prophecies of Daniel's Seventieth Week spoken of in Daniel 9:24 and Matthew 24:15, and culminate with the Christ's Second Coming, the establishment of the kingdom, and them sitting on twelve thrones judging the twelve tribes of Israel just as they were promised in Matthew 19:28. This is reflected in all their writings without exception. This apparently remained a hope until the eventual destruction of Jerusalem in 70 AD and the death of John: the last apostle. One would do well to remember this when they are reading anything between Hebrews and Revelation. They were always addressing the believing Jews and preparing them for the tribulation that they fully expected to come in their lifetimes.
Paul, on the other hand, had turned to the Gentiles and the establishment of the church: The Body of Christ. As such, the apostles were teaching the Gospel of the Kingdom that required repentance and baptism, while Paul was teaching the Gospel of Grace that required only belief in the death, burial, and resurrection of Christ. As I mentioned earlier, failure to see this transition is the reason for so much confusion in the church today, e.g., baptismal regeneration, amillennialism, postmillennialism, preterism, replacement theology, much of the Pentecostal movement, the loss of salvation, etc. In my opinion, it is only through the lens of the dispensational view that these issues can be remedied.
Spearman, H. Dwayne. The Book of Acts Rightly Divided (pp. 7-8). Directional Bible Ministries. Kindle Edition.