The universe is about 13.8 billion years old, so any light we see has to have been travelling for 13.8 billion years or less – we call this the ‘observable universe’.
However, the distance to the edge of the observable universe is about 46 billion light years because the universe is expanding all of the time.
Imagine that a photon of light is emitted from a point on the edge of our observable universe.
While that photon has been travelling through space, the universe has expanded. We have moved away from the point where the light was emitted, and it has moved away from us!
Though the light might have only travelled for 13.8 billion years, the distance from us to the point it came from is, at present, 46 billion light years!
So how big is our universe? Well we don’t really know, but it’s big. So big that even light hasn’t had time to cross it in nearly 14 billion years! And it’s still getting bigger all of the time.
Read more at: https://phys.org/news/2015-10-big-universe.html#jCp
But, since the only tangible measurement is through “visible light”, the universe is expanding at the speed of light.