Acts 1:6-8 Therefore, when they had come together, they asked Him, saying, "Lord, will You at this time restore the kingdom to Israel?" And He said to them, "It is not for you to know times or seasons which the Father has put in His own power. But you shall receive power when the Holy Spirit has come upon you; and you shall be witnesses unto Me in Jerusalem, and in all Judea and Samaria, and to the end of the earth."
I love this passage of scripture. If you can imagine the disciples on this day -- they had gone through a roller coaster ride of emotions over the past 50 days. They had seen their Lord crucified. And then had gone into hiding ... until they discovered in amazement, He was alive! Just over 7 weeks had transpired and they were now watching Yeshua (Jesus) departing Earth and returning to His Father. The disciples were understandably unsure what was next, and so they asked a very reasonable question -- "Lord, will you at this time restore the Kingdom to Israel?"
Notice that Yeshua did not answer the question directly or give them the details they were expecting. He merely said, "It is not for you to know the times or the seasons...." But then He set His own precedent and called them to be Holy Spirit-empowered witnesses for Him and His Kingdom.
We don't know the exact timing of His return and the coming of His Kingdom either, but just as those disciples were, we also are called to receive the power of the Holy Spirit and be His witnesses. We must seek the fullness of His Spirit, become empowered, and eagerly participate in this great end-time mission, a harvest that likely will dwarf all that has gone before, and be part of a rich welcome for our glorious and awesome God!