That idea where time came from the Primordial Mind sounds like headcanon.
Before the beginning of all, there existed a presence: a primordial mind, infinite, awesome, and set to inscrutable purpose. As the universe thundered into being, this mind was fragmented and scattered. Two among its greater fragments—who would come to be named Radiant and Dire--found themselves locked in vicious opposition, and began twisting all of creation to serve their conflict.
Not everything sprang from the Primordial Mind itself. Elder Titan was responsible for the creation of the universe, and it's implied that he shattered everything in the universe that he made, including the Primordial Mind itself. From that event, the PM's many fragments that are named Radiant, Dire, Arc Warden, and many more that weren't named were begotten into existence. In Void Spirit's lore he mentions Elder Titan as the one who created the universe and caused the Schism which is apparently the scattering of the 4 Fundamental forces from the Fundamental Plane. Shortly after those events, time began to flow in the universe. Here's Void Spirit's monologue as proof:
Before there was the spirit, there was the void. Before there was anything, there was the void.
Long after -- though only a moment in the scope of the whole -- there came...a being of great power.
Still without comprehensible form or voice of my own, I felt this titan's hammer fall and the four children scatter.
I began to find myself in the reverberations of the blow. And I saw the expanse of time flash forth from the instant.
In that cascade of moments, I knew I must learn to compose a form capable of interacting with the material plane.