Grammar

No.

The simple present can be used to express one's plans:
A: What are you doing for the weekend?
B: I'm skiing with my cousins.


A: What are you doing on Friday?
B: I'm working all day.

Or maybe someone calls you today while you're working:
A: Hey, can you help me move a couch?
B: I can't. I'm working all day.

However, it does not mean "I've been working all day." The present perfect continuous only reports on the past leading up to the present, not so much for the future.

I need to work on conciseness, don't I? Brevity in writing is a virtue, I understand.

thank you very much for your help

thank you very much

You are doing fine. "Duty" is a tends to be the master.

There was an Air Force officer many years ago who used to conduct workshops about just that. He fold an excellent anecdote about Washington. Two Continental soldiers had been arrested in the act of raping a woman, and were tried. Their colonel sent a message to Washington to the effect:

Soldiers convicted, recommend execution.

Washington wrote, on the same scarp of paper: Concurred in.

The colonel sent back that same piece of paper with the message: Executed.