Is that too much food?

I don't think that is too much at all -- although, I would want at least one yolk in the mix to make a complete protein.  I would do 3 egg whites with one whole egg.  That's just me though -- you're definitely not overeating on that at your time out.

Egg whites aren't as nutritious as the whole egg so I usually don't eat just them.  Even at five months out I could eat four scrambled whites, no problem.  I usually opt for 2 eggs instead, though, or 1 egg and some meat.  I try for 20-25g of protein per meal myself, though.  I find that's harder to do with just eggs and keep the calories lower so I always add greek yogurt, meat, or a protein shake to breakfast.