We can use this structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition." for actionA general term expressing that somebody or something does somethings happening in the immediate future:

Hurry up! The ceremony is about to begin!
They are about to kiss each other.

Be about to is often used with just:

They are just about to leave.

The present perfectThe aspect expressing completion. E.g.: He’s finished university. tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. is used for recently completeA concept, related to the perfect aspect, expressing that an action has finished. E.g.: He’s finished university.d actionA general term expressing that somebody or something does somethings, usually with the word just.

I've just bought a processor. My computer needed to be upgraded.
I have just started a typing course.

Note that when the exact point of timeA particular moment in time. E.g.: She came home at six. ("six") I was born in 1980. ("1980") is mentioned we use the past simple.