As the others talk, what does Macbeths aside reveal about his thinking? What does Macbeth mean in his aside about two truths being prologue to the act of the imperial theme?

Macbeth's brain is already churning around over the idea of being king. The two truths have come to fruition; he was Thane of Glamis and now Thane of Cawdor. The swelling act remains, he is thinking of killing the king. The imperial theme being his final ascension to the throne as the Weird Sisters suggested.