"It's terrific going," said Smith. "He has worked hard this season in terms of his fitness and has done really well for us. I think he is improving as a player.
"I have absolutely no complaints. I know exactly what he can do. 50 goals in two-and-a-half years in Rangers teams that maybe haven't been that superior to the opposition is testament to him."
Boyd has often been criticised for not working hard enough and contributing little else to matches other than his goals but Smith insists the prolific hitman has nothing to prove as far as he is concerned.
"He has never let it affect him," said the Gers boss. "Kris Boyd doesn't need to show me anything other than what he has shown since he has been here."