The seventh volume of the comic Douluo Continent had already been published.
I'm not very clear about the specific publishing situation of Battle Through the Heavens because I'm just a fan of online literature and can't get the latest publishing information. But generally speaking, the number of comic books published was different from the number of single copies. If you are referring to the number of standalone volumes of Battle Through the Heavens, then there is currently no official standalone volume of Battle Through the Heavens.
As of now, quite a few. But the exact number keeps changing as new ones come out.
Currently, three volumes had been published on the Douluo Continent.
As of now, there are around 15 volumes of the Overlord manga. But the number might increase over time as new volumes are released.
The number of volumes of Overlord manga varies depending on the latest releases. Currently, I think it's approximately 14 or 15. Keep an eye on the official sources for the most accurate and up-to-date count.
The Peerless Tang Sect had produced four volumes.
The Caiyun Kingdom Monogatari novel had 13 volumes already.
The fourth volume of Fei Dan's Physical Book of Arria had been published.