Here's a breakdown:
* Uhm: This is a filler word used to gain time while thinking or to express hesitation.
* en verdad: This means "really" or "truly."
* se nos hizo: This is a common expression in Spanish that translates to "we became" or "we ended up."
* tarde: This means "late."
So the whole phrase conveys a sense of surprise and realization that they have run out of time, perhaps with a bit of apologetic tone.