What was Jesus ready to offer Israel when He was present as their King?

Les teaches that when the King was present, He was ready to bring the whole Abrahamic covenant into fruition by ushering in the kingdom. But Israel rejected the King, and when they rejected the King, they rejected the kingdom, and the Lord went back to heaven. Les explains that the kingdom is now centered in heaven, and believers are translated into that kingdom at salvation. Yet it is the same kingdom that will come back on the earth, where believers will rule and reign with Him. He notes this will come later. Les also points out that Peter, in Acts chapter 3, rested on the Abrahamic, Davidic, Palestinian, and Mosaic covenants, saying 'unto you first,' meaning the nation of Israel. Les observes that people often run ahead, wanting him to get to Paul's epistles, but he takes it step by step, and Paul's epistles are coming, including Romans, where God deals with Gentiles under grace, not under the Mosaic system.