I believe that the Biblical end times have already passed. There are over 100 passages in the New Testament indicating the imminent fulfillment of the "last days" and Christ's second coming. In contrast, there is not even one verse that hints at these things being delayed. Some people have attempted to find a delay in Romans 11, but a careful reading will show otherwise. For example, many people read Romans 11:26 and interpret it as if it said, "and after this all Israel will be saved." However, it really says, "and thus all Israel will be saved," explaining in what manner "all Israel" was currently being saved. In Revelation 1:1, we read, "The Revelation of Jesus Christ, which God gave unto him, to shew unto his servants things which must shortly come to pass;" The Apostle John inserted the word "must" to make it emphatic. If the prophecy was still thousands of years future, there would have been no reason for him to add the word "must." Likewise, at the end of the book of Revelation, we read, "And he saith unto me, Seal not the sayings of the prophecy of this book: for the time is at hand." This is in stark contrast to Daniel 12:4 where it says, "But thou, O Daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased." The time of the end had come. What was sealed had become unsealed. There was no stopping those things from happening.
Jesus' first coming was contrary to the expectations of His contemporaries. Likewise, Jesus' second coming has been contrary to the expectations of the majority of Christians. However, a careful reading of Isaiah 65 and 66 clearly shows that the new heaven and new earth were prophesied to come at the destruction of Jerusalem when God would be calling his people by a new name. That new name is Christian. The new earth is the Christian age we are currently living in. It is the age of grace, the eternal age of Messiah where His kingdom is continuously expanding (Isaiah 9:7).
My belief that the end times has already passed is formally called Preterism. I don't plan on writing any articles on Preterism, but I think the below content is helpful.
The Parousia by James Stuart Russell (published in 1887, it is a standard introduction to Preterism.)
What Happened In 70 AD? by Ed Stevens
The Final Decade Before The End by Ed Stevens
International Preterist Association by Ed Stevens (This link points to an archive of podcasts.)
Where was sin defeated? Debate between Kurt Simmons and Don Preston (This is an important debate between two Preterists. Simmons is an "individual body view" Preterist and Preston is a "collective body view" Preterist. It is my opinion that Simmons decisively defeats Preston in this debate and shows the errors of the "collective body view.")
The Berean Preterist by Richard Eckhart (This is Eckhart's Youtube channel where he exposes the errors of the "collective body view" of Preterism.)