There were no humans in heaven prior to the death of Jesus Christ which was necessary to atone for the sin of the first parents and all of mankind’s sins till the end of time. With Jesus’ death, the great redemptive force was unleashed (” and He descended into Hell” – there is a quite thorough explanation of this mystery at https://catholicexchange.com/meaning-behind-descended-hell ). Imagine the joy of Heaven when the many who waited, without pain of any kind, for the great moment when they would populate Heaven.
And speaking about humans in heaven, it is often said we don’t know if anyone is in Heaven. That is largely true but today’s gospel certainly lets us know of a few that are (now) in Heaven:
“And there will be wailing and grinding of teeth
when you see Abraham, Isaac, and Jacob
and all the prophets in the kingdom of God… “Luke 13:22-3
For those who will wail something about misogyny miss the point that Israel routinely mistreated her prophets and that this is a pointed comment from Jesus making clear that false prophets and those who igorned God’s word through the prophets are not likely heavenly residents.