So... is Ganbare Genki finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: April 01, 1981
Manga finished: January 01, 1981
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Ganbare Genki follows the journey of young Genki, who loses his mother at birth and is raised by his unconventional boxer father, Shark Horiguchi.
Genki idolizes his father and dreams of becoming a champion like him, despite his father's struggles.
Tragedy strikes, and Genki is orphaned, being taken in by his grandparents who disapprove of boxing.
Undeterred, Genki secretly pursues his passion for boxing, encountering mentors and rivals who shape his path.
The anime chronicles Genki's efforts to become a boxer, overcoming obstacles and forging his own identity in the world of boxing after his father's death.