Amen Brother, excellent ! God's Elect, because of non imputation of sin, according to God's Eternal Purpose in Christ, Eph. 3:11, were and are in an Eternally Justified state because of their Election in Christ, their Head and Surety from Everlasting!Eternal Justification in the Gospel because of Non Imputation!
2 Cor 5:19
19 To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
When else could it have been that this non imputation of sin unto God's Elect, The World, but in the Eternal engagements of the Everlasting Covenant, when Christ agreed and became the Surety, voluntarily bound Himself to satisfy God's Law and Justice in their behalf, and hence, that God the Father in trust in His Son's fidelity, freely dismissed the Elect from all charges of iniquity that was rightly due unto them and hence their Justification Rom 3:24287
24 Being justified freely by his grace through the redemption that is in Christ Jesus:
And when He became sin for them by imputation and Covenant Suretyship, they also became the Righteousness of God in Him 2 Cor 5:21, this occurred at whatever point from Everlasting, that their sins and the condemnation of it was imputed to Christ, so that He would in the fullness of time come forth and make satisfaction for them, they therefore being forever discharged in the chambers of the Heavenly Court, where these things were Transacted and agreed upon between the Father and the Son, and the Spirit beareth witness !