I had a little bit of trouble finding information about this phrase. The basic Bible study tools that I own didn’t have much information. However, the Kindle version of the New English Translation (with full notes) had a well worded explanation.
“Your kingdom come represents the hope for the full manifestation of God’s promised eschatological rule reflected in the OT prophetic literature, the ongoing hope of the Jewish people, a hope which is subsumed by Christianity.”
Those of us who serve Jesus look forward to positive future times as described in the book of Revelation. The hope that we have is not just wishful thinking. Hope in God’s Word is a guarantee. He will always do what He says. God never fails.
This phrase of the Lord’s prayer shows a willingness to allow God to work towards something He has promised will happen. We need to cooperate with His will. And friends – when we allow ourselves to be open to God’s way, we are more likely to be satisfied. God’s gifts are always the best.