Well if already saved and in the state of Grace...there's no reason for indulgences...there is no further punishment temporal or otherwise.... Jesus said ..”It is finished”...He also said.......”I write these things to you ‘who believe’ in the name of the Son of God so that you may ‘KNOW’ that you have eternal life.”... I John 5:23
Jesus satisfied “all” judgment....”all” requirements... of a Holy God for... “all” our sin. Not in part but the whole.
As for Sanctification....
Here again Jesus says in John 17:19 ...”And for their sakes I sanctify myself, that they also might be sanctified.”......Jesus was set apart for his office as Mediator... he voluntarily devoted himself to this work, thus we are sanctified to finish our work here on earth as well. ...
Additionally that they also might be sanctified through the truth; ....As written in John 17:19...”I sanctify Myself, that they themselves also may be ‘sanctified in truth’...Jesus ‘IS’ the truth...being saved we are ‘IN Him’ by and through His Spirit which dwells with us as believers..
And again...Jesus clearly states....”You are ‘already’ clean because ‘of the word’ I have spoken to you.”...John 15;3
And of course Hebrews 10:10 tells us.....”..by that will, we have ‘been made holy’ through the sacrifice of the body of Jesus Christ ‘once for all’...Hebrews 10;10
Soo....”There is now ‘therefore’ no condemnation for those who are in Christ Jesus...Romans 8'1...not now nor later when we see Jesus!
Here is why I say the Protestantism falls into the trap of legalism, seeing things only in the forensic or juridical terms of crime and punishment. Temporal punishment is not judicial punishment or debt owed because of sin. It is rather the consequences of the sins we commit. From the Catechism:
1472 To understand this doctrine and practice of the Church, it is necessary to understand that sin has a double consequence. Grave sin deprives us of communion with God and therefore makes us incapable of eternal life, the privation of which is called the "eternal punishment" of sin. On the other hand every sin, even venial, entails an unhealthy attachment to creatures, which must be purified either here on earth, or after death in the state called Purgatory. This purification frees one from what is called the "temporal punishment" of sin. These two punishments must not be conceived of as a kind of vengeance inflicted by God from without, but as following from the very nature of sin. A conversion which proceeds from a fervent charity can attain the complete purification of the sinner in such a way that no punishment would remain. (Cf. Council of Trent (1551): DS 1712-1713; (1563): 1820.)Every time that we sin we increase our disordered affection for sin. This is the temporal punishment of sin and it remains even after we are reconciled with God. This is what is cleansed through the penitential life or in purgatory after death. It is not a question of judgment and the payment of a debt of sin beyond that of our Lord on the Cross but rather of the cooperation with the healing grace of God.