What does Psalm 37:29 mean?

Although Israel has not yet possessed all the land God promised to Abraham and his descendants, someday Christ-honoring Jews will dwell securely in that land. God said to Abraham: "To your offspring I give this land, from the river of Egypt to the great river, the river Euphrates" (Genesis 15:18). In Genesis 17:8 he promised Abraham again: "I will give to you and to your offspring after you the land of your sojourning, all the land of Canaan, for an everlasting possession."

The time of this possession awaits the second coming of the Messiah to establish His kingdom (Isaiah 9:6–7; Zephaniah 3:14–20). The prophet Micah wrote about the Messiah's kingdom and identified Jerusalem as its capital. He described it as a time of security, when every man will sit under his vine and fig tree, and no one will make him afraid (Micah 4:4). In verse 7 he pictured the Lord reigning from Mount Zion [Jerusalem] over the returnees to the Promised Land.