Just so you are aware. Both tomato plants will only reach their maximum potential if grown apart. Otherwise they will be tussling for available resources - nutrients, water, space and light. If you are okay with this then by all means keep them together. I would personally separate them and plant each into their own pots.
You’re welcome @B3 Yes much easier now before the root networks have become too established and intertwined. I don’t have a dibber tool so I just use the pointy end of a pencil ✏️ or the tines of an old kitchen fork 🍴 to gently tease the seedlings apart taking lots of care not to damage the roots or stems. The leaves are the toughest part of the seedling at this age so you are always best off holding the seedlings by their leaves while you manipulate them out of the soil in the old pot and then pot them on into their new pot. 👍
I usually put 2-3 seeds in a pot, murder the weaklings, it's just what would happen in nature. I take them out early though, soon as it is clear which one is the winner.
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I live in west central Scotland - not where that photo is...