If one understood the covenant of grace, it would be perceived to be made in eternity amongst the Godhead, and at which time Christ became a surety for the sins of Gods Elect, so at that time the condemnation of the elect which they would incur in Adam and in themselves would be charged to the Surety of the covenant, and God would look for Justice and satisfaction from Him and not them, hence by that arrangement alone the elect were Justified from their sin and condemnation before the foundation, not in themselves, but in their Surety.
If one understands the covenant of redemption, it would be clear that God the Father chose an elect, the Son volunteered to atone for their sins, and the Holy Spirit will gather the elect.
This was finished by Christ alone, and He alone applies all the benefits to the elect at the chosen time.
until the elect are regenerated they like the rest by nature were children of wrath.
though this was the agreement in eternity between the Father, Son and Holy Spirit it is a guarantee and will infallibly be carried out. Christ said, of all the Father had given Him, He will loose none. So as far as God is concerned, it is finished.
But according to working His predetermined plan to us who are subject to time, it is accomplished in time. It’s obvious because scripture is very clear about it.
So in eternity the elect are redeemed; in time Christ told us at the cross, “It is finished”
And the Holy Spirit continues to gather the elect.
Redemption is applied in time.