If that is really your only goal, then add in cardio, possibly Hiit sprints, the only way you will "tone" is by dropping bodyfat, and increasing mass slightly.

that being said, I'm sure you dont want to be non-symetrical, so working chest alone isnt going to cut it. I would drop the pushups, and focus on pushing the bar, flat and incline bench, squats, deads, and rows ... 2-3 times a week, for 2-3 sets of 12-15 reps. Just understand that once you get into this, you will get addicted, and want to do more.

__________________
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.