So... is Tanaka-kun wa Itsumo Kedaruge finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 25, 2016
Manga finished: July 25, 2019
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
Tanaka is a high school student whose defining characteristic is his extreme laziness. He actively strives for a life of quiet, uneventful days, where he can conserve his energy and avoid any sort of exertion.
His best friend, Oota, is a helpful and reliable presence who often assists Tanaka with tasks he finds too troublesome to handle himself.
Despite Tanaka's best efforts to maintain his listless existence, the everyday happenings of high school and the people around him constantly interrupt his pursuit of ultimate relaxation. The anime explores his attempts to remain lazy amidst these disruptions.