Verses 22-24 say
22Instead, you have come to Mount Zion, to the city of the living God, the heavenly Jerusalem. You have come to myriads of angels 23in joyful assembly, to the congregation of the firstborn, enrolled in heaven. You have come to God the judge of all men, to the spirits of the righteous made perfect, 24to Jesus the mediator of a new covenant, and to the sprinkled blood that speaks a better word than the blood of Abel.
Note, the *heavenly* Jerusalem....and angels, ...the firstborn, enrolled in heaven, ...the spirits of righteous made perfect.
It doesn't say "when you die you are going to come to" but it says "you *have* come to".
Gw ,
12:14–29 Is a new section contains the 5th warning in Hebrews: The Danger of Unresponsiveness
It is not about saints or angels watching and cheering.