Does Saitama have enhanced senses?
yes he had according to his wikia he possessed the superhuman strength https://onepunchman.fandom.com/wiki/Saitama 

Immense Senses: Saitama's senses are far beyond the human norm. Nevertheless, Saitama's senses do not have the same degree of 'resolution' as some of Genos' sensors, which can detect and distinguish foes at a greater distance. Even so, he does possess impressively sharp hearing, being able to pick up on various chatter from bystanders a good distance away even while fighting monsters and the like.