我哋一般講晩ごはん或者夕飯食べた？/昼ごはん或者昼食食べた？，然後都可以講ランチ食べた？（你已經食咗晏呀？），但係想講你已經食咗晚飯時，我哋通常唔用ディナー呢個單詞因為呢個單詞，我哋有時指比較貴嘅晚飯。所以你想用ディナー呢個單詞時，請注意啲啦！

If you're talking about the tense, just use simple part in this case. It's understood that the meaning is 'any time up to now' from the context; ランチ食べた？/食べましたか？

Hi! As you know, 朝食／朝御飯 "breakfast" and 昼食／昼御飯 "lunch" and 夕食／晩御飯 "dinner" are meals --> simply（御飯） Therefore you can simply say: 御飯はもう食べましたか

朝ごはん/昼ごはん/晩ごはんをもう食べましたか? good luck!

朝ごはん/昼ごはん/晩ごはんをもう食べましたか? good luck!