今日はもう

for today, already

→ 今日
phrase Uncommon #15,419
for today, already Combines 今日は (today) with もう (already, now, or no longer). Depending on context, it can mean that something has already happened or that there is no more of something for today.
JA: 今日はもう帰ります。
EN: I'm going home for today.

今日はもう誰かキスしましたか

Have you kissed anyone today?

今日はもう何もすることがないんだ

I don't have anything else to do today.

今日はもう帰りたい

I just want to go home now.

今日はもう非番何か食おう

I’m off today, so let’s grab something to eat.

— フォーリング・ダウン (1993)

今日はもう寝よう

Let's go to bed for today.

今日はもう聞かない

I won’t ask anymore today.

今日という今日はもう許さんぞ

Today, of all days, I’m not letting you off!

— ロード・オブ・ザ・リング (2001)

今日はもう会えないかと思ったよ

I thought I wouldn't get to see you today.

今日はもう寝ろ

Go to bed already.

— レオン (1994)

今日はもう誰も来ないと思う

I don't think anyone else is coming today.

私は今日はもうがない

I don't have anything else to do today.

今日はもう入れない帰りなさい

You can't come in today. Go home!

— ニュー・シネマ・パラダイス (1988)

今日はもう朝ご飯食べた

Have you eaten breakfast yet today?

今日はもう寝る

Are you going to bed already?