“I'm so out of it this morning.”
You accidentally sent your coworker the wrong file. He points this out, and you apologize. You explain that you've been making a lot of small mistakes this morning, and can't focus well.
I'm so out of it this morning.
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"This morning" means the morning today. You can use it to talk about something earlier or later:
What time did you leave this morning?
What time are you leaving this morning?
"This afternoon" and "this evening" work the same way:
I had coffee with Mr. Hernandez this afternoon.
Hey, are you doing anything this evening? I was invited to this party and I was wondering if you'd like to join me.
Being "out of it" means being tired, sleepy, distracted, or not focused.
You use "out of it" like this:
You seem kind of out of it today.