Big Crunch/Cyclic Universe theories are generally considered to be improbable based on our current understanding of the universe. That there is no time before

Big Crunch/Cyclic Universe theories are generally considered to be improbable based on our current understanding of the universe. That there is no time before the big bang (possibly with some qualifiers to define the big bang, start of the universe, etc.) is the overwhelmingly prevailing view of modern cosmologists, from how I understand things.