So... is Ex-Arm finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: March 29, 2021
Manga finished: February 27, 2021
... 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
In 2014, Akira Natsume suffers a tragic accident. Sixteen years later, he awakens as a brain inside a powerful weapon called an EX-ARM.
He is partnered with a police officer, Minami Uezono, and her android partner, Alma, who explain his new reality. They face immediate danger aboard a smuggler ship and must rely on their combined skills to escape.
Akira's past memories inspire him to fight, and he discovers the immense power he now wields as an EX-ARM.
After successfully returning to land, Akira joins a special police team dedicated to neutralizing the threat of other EX-ARMs, determined to stop those who would misuse their power.