they look perfectly fine to me
There are little white marks along the stem, but I don't know if they are good, bad or normal.
One possibility is something called oedema (aka edema) which is basically caused by over-watering and a humid atmosphere. The plant takes up more water than it can cope with and you get little bumps forming on leaves and stems. It's not a big problem, but if you wait until you see the plant starting to wilt slightly before you water it, the problem may just go away. You won't harm a tomato plant by letting it wilt slightly, and it may even spur it into flowering a little earlier.