Yes, following the major anime finale that made Kaguya-Sama Love is War Season 3 the highest-rated anime on MAL, the manga of the long-running series has also announced its ending. According to the announcement in the 31st issue of Shueisha's Young Jump magazine, Kaguya-Sama Love is War Manga will end in 14 chapters.
The manga entered its final arc on October, 21, and is now officially ending with 28 complete Volumes on October, 22.
Kaguya-sama: Love is War started its serialization in Shueisha's Miracle Jump magazine in May 2015, and a year later moved to Young Jump in March 2016. The manga got its first anime adaptation in Jan 2019 and has since become one of the most beloved anime franchises, internationally, in just 3 Years.
Kaguya-sama wa Kokurasetai: Tensai-tachi no Renai Zunōsen, season 2 of the Television anime aired in the April of 2020, whereas the series got a Special Ova in May of 2021.
Kaguya-sama wa Kokurasetai -Ultra Romantic-, the third season of Kaguya-Sama aired in the April of this year. The hour-long special finale of Kaguya-Sama Season 3 announced a planned animation following the events of Season 3's end, to come out sometime next year.