Context: talking about age.
I will turn 20 on coming Sunday.
I will turn 20 in June.
I am turning 20 on coming Sunday.
I am turning 20 in June.
In conversation we use contractions. I will - No. I'll - Yes.
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In conversation we use contractions.
I will - No.
I'll - Yes.
I am - No.
I'm - Yes.
Note, however, that the versions without contractions are not grammatically wrong.
on coming Sunday - No.
this coming Sunday - Yes.
kumenglishI'll turn 20 this coming Sunday.
I'll turn 20 in June.