We can't prove that Newton's law of gravity is perfect at all distances. If it is, the effect of gravity diminishes by the inverse square, making it extremely small at extreme distances. Beyond some distance, dark energy makes gravity inconsequential.
We also can't prove that the universe is finite in size. If it is infinite, then the effect of gravity becomes zero at infinite distance.
We also can't prove that the force of gravity propagates at finite speed. Many scientists claim that gravity force propagates at the speed of light, which make it zero at the Hubble limit.
I believe the foamy texture of galaxy clusters, shown in your attached image, minimizes gravitational potential energy on the scale of about 10^24 m. Beyond that, there don't seem to be any gravitationally bound structures.
I don't think the answer to your question is knowable, but I suspect the answer might be NO.
Proponents of big bang theory may disagree with me. They refuse to admit the long list of things they're assuming.