Which one of the things the witches said about Macbeth is about to come true ( you know but he doesn't)?

"All hail, Macbeth! Hail to thee, Thane of Cawdor!" Macbeth is actually already Thane of Cawdor when the witches. Macbeth was fighting the Norwegians and Macdonweald at Forres when someone else was fighting the Norwegians and Cawdor at Fife, so Macbeth is not even aware that the Thane of Cawdor is an attainted traitor. Hence he scoffs at the idea that he could be Cawdor when "the Thane of Cawdor lives, a prosperous gentleman". However, Ross, Duncan, the witches and the audience know that Macbeth is the new Thane of Cawdor, even though he doesn't.