The present perfect simple expresses an action that is still going on or
that stopped recently, but has an influence on the present. It puts
emphasis on the result.
1. We use the present continuous tense for activities that are happening just now.
Examples: I am doing some English exercises at the moment. You aren't listening! Why is he sitting here?
2. We use it for an action happening about this time (today, this
week), but not necessarily at the moment of speaking. It is a temporary
activity.
Examples: I am in London. I am staying at the hotel. (But just now you can be somewhere else.)She can't go out. She is writing her essay today. (But she can be having lunch at the moment.) You can't borrow this book today. Mary is reading it. (But not right now.)
3. With a future time expression (soon, on Monday) it is used for
definite arrangements in the near future. The continuous tense is more
personal than the simple, because it expresses the speaker's plan.
Examples: I am leaving soon. We are meeting on Monday.