Now in a while
At some point. Possibly today. Possibly never. Do not wait in.
I'll do de dishes now in a while, Mam.

Shall I translate it into posh English for you, horse?
Hello, I've just finished my crossword. Here it is in posh English.
I shall attend to the dishes at some unspecified future juncture, Mother.
Questions
What does now in a while mean in Ireland?
At some point. Possibly today. Possibly never. Do not wait in.
How do you use now in a while in a sentence?
“I'll do de dishes now in a while, Mam.”
Updated
On the list: Irish slang phrases