Only for now.
With the God-Locking Chain and the God-Slaying Cauldron providing a dual layer of defensive overlapping, even if he managed to hit the target using the God-Slaying Bone-Breaking Bow and the God-Slaying Bone-Breaking Arrow, he could at most severely injure Ancient Cauldron, but never truly kill him with an arrow.
As for using the arrow to kill other Half-Step Transcendent Universes, would that be of any use?
Chapter 1477