Matthew Henry's commentary on Michael the Great Prince of Jehovah's people.

It is usual with the prophets, when they foretel the grievances of the church, to furnish it at the same time with proper antidotes, a remedy for every malady. And no relief is so sovereign, of such general application, so easily accommodated to every case, and of such powerful efficacy, as those that are fetched from Christ and the future state; thence the comforts here are fetched.

I. Jesus Christ shall appear his church’s patron and protector: At that time, when the persecution is at the hottest, Michael shall stand up, Dan. 12:1. The angel had told Daniel what a firm friend Michael was to the church, Dan. 10:21. He all along showed this friendship in the upper world; the angels knew it; but now Michael shall stand up in his providence, and work deliverance for the Jews, when he sees that their power is gone, Deut. 32:3. 6. Christ is that great prince, for he is the prince of the kings of the earth, Rev. 1:5. And, if he stand up for his church, who can be against it? But this is not all: At that time (that is, soon after) Michael shall stand up for the working out of our eternal salvation; the Son of God shall be incarnate, shall be manifested to destroy the works of the devil. Christ stood for the children of our people when he was made sin and a curse for them, stood in their stead as a sacrifice, bore the cure for them, to bear it from them. He stands for them in the intercession he ever lives to make within the veil, stands up for them, and stands their friend. And after the destruction of antichrist, of whom Antiochus was a type, Christ shall stand at the latter day upon the earth, shall appear for the complete redemption of all his.

II. When Christ appears he will recompense tribulation to those that trouble his people. There shall be a time of trouble, threatening to all, but ruining to all the implacable enemies of God’s kingdom among men, such trouble as never was since there was a nation. This is applicable. 1. To the destruction of Jerusalem, which Christ calls (perhaps with an eye to this prediction) such a great tribulation as was not since the beginning of the world to this time, Matt. 24:21. This the angel had spoken much of (Dan. 9:26, 27); and it happened about the same time that Christ set up the gospel-kingdom in the world, that Michael our prince stands up. Or, 2. To the judgment of the great day, that day that shall burn as an oven, and consume the proud and all that do wickedly; that will be such a day of trouble as never was to all those whom Michael our prince stands against.

Ps.here is John Wesley's take on Michael in Daniel 12:1

For the children - The meaning seems to be, as after the death of Antiochus the Jews had some deliverance, so there will be yet a greater deliverance to the people of God, when Michael your prince, the Messiah shall appear for your salvation. A time of trouble - A the siege of Jerusalem, before the final judgment. The phrase at that time, probably includes all the time of Christ, from his first, to his last coming.