When it comes to describing something that has been done at the last minute, there are several synonyms that can be used. Some of the most common ones include eleventh-hour, last-ditch, final, and the late hour. Other options include sudden, quick, impromptu, rushed, and hasty. Additionally, hurried, abrupt, immediate, promptly, and unexpectedly could also be used to describe something that was done just before a deadline or at the last minute. All of these synonyms can be helpful in making sure that your writing is clear and concise, and effectively communicates the urgency and immediacy of a situation.