As we use the word just for recent past:
I've just arrived.
They just completed their task when the manager called.
Can I use just for recent future that is going to happen shortly? As in:
A: How far are you from the top of the hill?
B: I'm just getting to the top.
M: We are running late, you must complete it as soon as possible.
N: I'm just completing it.
X: When will the mechanic come?
Y: He is just arriving.
Are these sentences fine and idiomatic?
How do native speakers say these?
Thanks in advance.