Time appears to have an arrow “direction” because of our observation of entropy. A glass falls off a table and shatters but never collects it’s pieces back off the ground to appear in a more ordered state. The “chicken and the egg” would be a singularity, the universe would have to have started in a highly ordered state in order for entropy to explain why time appears to have an arrow or a “direction” that moves forward. As I understand it entropy explains why time appears to have a “direction” in our everyday experiences. (of course the laws of physics, namely classical relativity makes no distinction between forward or backward and hold true regardless)
