What does Exodus 11:1 mean?

Then the Lord told Moses, 'I’m going to bring one last disaster on Pharaoh and Egypt. After this, he’ll let you go for good. In fact, he’ll be so eager to get rid of you, he’ll force you out.' Exodus 11:1 - Modern Text Bible

(God announces the final plague, promising that this will finally break Pharaoh’s resistance.)