'mr darcy's father worked for mr wickham's father'.did wickham tell this or not?

Yes, Wickham mentions his father's place in Darcy's home, but he does not go into detail about his father's duties. He makes their relationship sound like a friendship.

My father began life in the profession which your uncle, Mr. Phillips, appears to do so much credit to—but he gave up everything to be of use to the late Mr. Darcy and devoted all his time to the care of the  Pemberley property.