another Thursday in Advent

The lectionary today gave us a fitting psalm for Advent reflection; but is it a song of celebration or a song of anticipation/plea to the Lord?  Is this after "the Lord restored the fortunes of Zion," or when Israel is still in the darkness and waiting on deliverance, hopeful that the Lord who is faithful will yet still deliver them?  The first three verses sound like it's already happened, and the last three verses indicate it hasn't happened yet.  Is this a fitting eschatological hymn for us as we wait for the coming of the Lord? 

Psalm 126

¹   When the LORD restored the fortunes of Zion,
          we were like those who dream.
²   Then our mouth was filled with laughter,
          and our tongue with shouts of joy;
     then it was said among the nations,
          “The LORD has done great things for them.”
³   The LORD has done great things for us,
          and we rejoiced.

⁴   Restore our fortunes, O LORD,
          like the watercourses in the Negeb.
⁵   May those who sow in tears
          reap with shouts of joy.
⁶   Those who go out weeping,
          bearing the seed for sowing,
     shall come home with shouts of joy,
          carrying their sheaves.