Malachi is very conscious of timing:
“But before the great and terrible day of the LORD comes, I will send you the prophet Elijah.” (from Malachi 4)
That is going to be a very good day!
God doesn’t just rush in and shout: “Merry Christmas!”
Advent takes four weeks for a reason. Before the Messiah came the Messenger. Malachi announces John in today’s reading Malachi 3:1-18.