not right now
Not at this particular moment in time. A: "Would you like a slice of cake?" B: "Not right now, thanks. I'm still full from dinner." A: "Hey, Tom? I needed to ask you a couple things about the report." B: "Not right now—I'm in the middle of something."
not right now, thanks
No for the present. (It is hoped that one will be asked again later. Usually used for a [temporary] refusal of a serving of food or drink. There is an implication that more will be wanted later.) Waiter: Do you want some more coffee? Mary: Not right now, thanks. John: Can I take your coat? Sue: Not right now, thanks. I'm still a little chilly.