Experiencing an “open heaven” is a season of manifestation when revelation is accessed and God’s people experience the Supernatural.
At such times accurately positioned believers experience tangible manifestations of God’s promises and fulfillments of past Prophetic utterances.
In the Old Testament open heavens were defined seasons but after Christ, the heavens have remained open and the only limitation is our positioning. For Adam, the “Garden” represented an “Open Heaven” position when he left it he lost access.
We are definitely living under an open heaven and the reality is that from the perspective of Kingdom reality, we should be experiencing different measures of prosperity and increase and these should be incremental as we go along with no one left behind.