What does Nehemiah 6:1 mean?

When Sanballat, Tobiah, Geshem the Arab, and the rest of our enemies heard that I’d rebuilt the wall and there were no gaps left—though I hadn’t put up the doors yet— Nehemiah 6:1 - Modern Text Bible

(Nehemiah’s opponents realize the wall is almost finished, except for the gates, and see their window to interfere closing.)