Is this portion size for lunch too much?

I am running 5km for 30 minutes three times a week because I want to lose weight.
For my meals, I eat home-cooked meals for breakfast and dinner, and I only eat a lunch box like this for lunch.
Sometimes I drink protein supplements in the evening, and sometimes I don't.
A typical lunch consists of one Soboru bread (streusel bread), one boiled egg, fruit (one kiwi, half an apple, and a few cherry tomatoes), and a few jujubes. Sometimes I eat one boiled sweet potato instead of the jujubes. What do you think about this portion size for lunch?