So... is Tezuka Osamu no Kyuuyaku Seisho Monogatari: In the Beginning finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
In the Beginning tells a story from the Old Testament, specifically focusing on a well-known event.
It explores a significant myth involving a man, his family, and a grand vessel.
The anime promises to depict this famous story through the unique artistic lens of Osamu Tezuka, albeit completed by Director Dezaki after Tezuka's passing.
It appears to be a faithful, yet potentially distinct, interpretation of biblical narratives.