"Would you like to order when everyone has arrived?"
"Would you like to order when everyone has arrived?"
"Would you like to order ~" 「〜注文なさいますか？」
"when everyone has arrived" 「おそろいになってから」"when everyone is here?" も言えます。
[これも](https://eikaiwa.dmm.com/uknow/questions/56859/)役に立つかもしれませんので是非クリックしてください。
Would you like to wait until everyone else gets here to order?
Would you like to order once all the others have arrived?
この場合、次のような言い方ができますよ。
ーWould you like to wait until everyone else gets here to order?
「皆さんがお揃いなるまで注文をお待ちになりますか？」
ーWould you like to order once all the others have arrived?
「皆さんが来てから注文されますか？」
ご参考まで！
オーストラリア 
カナダ 
