So... is Mainichi ga Nichiyoubi finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: October 25, 1992
Manga finished: January 01, 1989
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Mainichi ga Nichiyoubi follows Yumi, a newly minted police officer, in the whimsical Tawagoto precinct.
Years after a mysterious stranger saved her life, she unexpectedly encounters him again during her first attempt to make an arrest.
This stranger, Tohru, is a charming magician whose skills prove surprisingly useful in Yumi's often bizarre police duties.
The series will likely explore Yumi's experiences as a police officer and her budding relationship with Tohru, as she frequently seeks his help with the unusual cases she encounters.