Three texts in 1 Peter are about heaven:

1Pet. 1:4 and into an inheritance that is imperishable, undefiled, and unfading, kept in heaven for you,
1Pet. 1:12 It was revealed to them that they were serving not themselves but you, in regard to the things that have now been announced to you through those who brought you good news by the Holy Spirit sent from heaven?things into which angels long to look!
1Pet. 3:22 who has gone into heaven and is at the right hand of God, with angels, authorities, and powers made subject to him.

Heaven is understood in 1:4 as a storage place — it may be more, but it is at least a place where the inheritance for the faithful is stored until the day when it will be brought out and they will inherit it. It is not clear when or how that will occur from this text.
Like the Son, the Spirit too is sent from heaven (1:12).
And like many NT texts, after Jesus’ death and resurrection, he ascended into heaven — to the place of God, to the throne room of God — where he sits and rules and intercedes etc (3:22).