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HI their, tomato can be a easy thing to grow but also can get a number of problems. Yellowing it not a big problem in tomato it is two thing, one is that as the leaves age they get old and yellow and die. this will happen from the bottom of the plant and work it way up, as the plant ages.
second thing is as it is flowering and fruiting it can be a lack in deficiency. The one's that turn leaves yellow are nitrogen, magnesium or iron , now look at the tomato plants they are Flowering and have or are beginning to fruit so if it a deficiency. I myself would have to say it a magnesium deficiency
Through a teaspoon of Epsom salt (Magnesium) in a water can and water the plant any Trace elements feed is good for plant's at flowering or fruiting season.

now if you get ring like spot on leaves this is most likely a fungal problem the most common one in tomatoes is watering ....

Watering at base level with a hose will flick soil up on to the leave, so then the soil manifest into fungal spores due to the sun. Now to fix this is to spray the plant with anti-fungal spray that you can get at your local garden store or nursery, after spraying take off the leaves that are infected and depose of them in the right manner.

Tip:- Work with the 3 D's which means (anything that is Dead, Diseased or Dying needs to be pruned off.

Benjamin Manning
Canelands Nursery

If they're getting sufficient water, it looks like a nutrient deficiency. However, for good fruit production, growing them in pots can be rather demanding - they do require a good balance of trace elements with adequate potassium and phosphorus mixed in with a complete fertiliser. The pics suggest they are a tall growing variety, which usually require staking. The dwarf varieties would be more suitable to pots. To be quite honest, I don't think you are going to be successful with those, if I were you I'd try a crop in an open garden.