I see where you are leading, but the sacrifice was done in our perspective or time box; just as salvation from justification to glorification is a time process. Jesus work on the cross was completed from Gods perspective before the first person ever was created.
Why would my perspective on the Mass mean a thing? You are unable to discern the basics of the gospel and salvation as you have proven on several posts as RocketMan and I have tried to help you. If you understood the “once for all” & “it is finished” and the clear explanation that Paul gives concerning the bread and cup, followed by the Acts and what the church actually did (break bread), then the question of a Mass would be a mute point in my opinion.
1 Corinthians 11:23-34
23 For I received from the Lord that which I also delivered to you, that the Lord Jesus in the night in which He was betrayed took bread; 24 and when He had given thanks, He broke it and said, “This is My body, which is for you; do this in remembrance of Me.” 25 In the same way {He took} the cup also after supper, saying, “This cup is the new covenant in My blood; do this, as often as you drink {it,} in remembrance of Me.” 26 For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until He comes. - Pretty simple and straight foreword explanation and Paul gives more insight to what actually took place at the Last Supper and we can see by Acts, this is how the church perceived it.
Before you can get to the Mass, one must start with proof of a priesthood as your church has established, then proof that priesthood established has the authority and power to command Jesus against His own words where He Himself said He would stay until all his enemies were made a footstool and lives to make intercession for the saints. Then you need to show the authority of the magesterium before you could get to the Mass.
I am not going to tell you not celebrate your Mass; that is central to your religion, but do not expect me to accept anything outside of what I believe God has said in His Word. We can discuss and debate our points of view and hopefully at the end of each day; we learn something new and positive from each other.
God bless you!
Timothy