Is Mr. Tonegawa Finished? Yes — Complete in 10 Volumes
Yes — Mr. Tonegawa is complete. It ended in Japan with 10 volumes; the final volume came out in August 2020. The serialization ended on June 8, 2020.
Everything below reflects the Japanese edition — the source of truth that runs months or years ahead of English releases — computed from official publication records.
Volumes in Japan: 10 (latest: 中間管理録トネガワ 10, 2020-08)
Next volume in Japan: not yet announced in Japan.
Status: Yes — Mr. Tonegawa is complete. It ended in Japan with 10 volumes; the final volume came out in August 2020. The serialization ended on June 8, 2020.
Serialized since: 2015