If in John 3:13-15, no man had ever gone to heaven, but he went to prepare a way, John 14:3, when will it be?

No one goes to heaven until everythin is done. When we die we are asleep until the day of judgement. Those verses are spoken to help people realize what happenes when we die. We dont go to hell nor heaven until the will of God is done meaning the end of revelation. Of corse Jesus is from heaven because he is the sone of God and his angels are the only ones in heaven.