How to say “Has everyone had lunch yet, or should I cook extra?” in Japanese

In Japanese

みんな、もう昼(ひる)ご飯(はん)食(た)べた？まだなら多(おお)めに作(つく)るけど。

Minna, mō hirugohan tabeta? Mada nara ōme ni tsukuru kedo.