Commentaire sur Michée 4:8

And you, tower of the flock Heb. מִגְדַּל עֵדֶר. Jonathan renders: And you, anointed one of Israel, who is hidden because of the sins of the people of Zion. His explanation is: מִגְדַּל is an expression of a stronghold, and he renders עֵדֶר as the people of Israel. He renders עֹפֶל as an expression of אֹפֶל, darkness. [I.e., מִגְדַּל עֵדֶר is the stronghold of Israel, identified as the Messiah. He is hidden because of the sins of the people of Zion. The word “hidden” is derived from אֹפֶל, darkness.] But it is possible to interpret מִגְדַּל עֵדֶר as the Temple, and עֹפֶל as an expression of a mighty tower. Likewise there is (Isa. 32:14) “Rampart (עֹפֶל) and tower.”

And you-tower of the flock – This is said of the city of Zion. It is a tower to which all the tribes of Israel, who are called a flock in many places, gather on the festivals. And it says ‘the tower of the daughter of Zion’ for further clarification. That is to say that the limping, driven out masses will come to you Zion.

(Not an exact translation)

to you it shall come—The remnant of the limping ones and the scattered ones shall gather to you.

The re-establishment of the Jews as a "strong fortress" will happen in 3 parts: 1) Those who were exiled from Yehuda and Binyamin will begin to return to Tzion; 2) There will be a "small government" like Bnei Yisrael had before their first monarchy, led by shoftim; 3) There will be the establishment of malchut beit David, when Mashiach will rule. Malchut beit David will be revealed in stages, the first of which is only at the level of a shofeit, and then it will slowly rise to the point that HaShem will have malchut.

and the former kingdom shall come—The complete kingdom, in its entirety, shall come to the house of David in Jerusalem as it was originally, before it was divided. Now what was the former kingdom? The kingdom of the daughter of Jerusalem.