now you're cooking

any time now

Very soon.

cooking with gas

Functioning particularly effectively; achieving something substantial.

now and again

Synonym of occasionally, sometimes, intermittently.

now and then

Synonym of occasionally, sometimes, intermittently.

now for

Used to introduce something that is to occur or be presented next.

now or never

At this sole opportunity or time, or not at all.

now you mention it

Used to precede another comment about something just mentioned.

now you're talking

A phrase indicating agreement with a previously stated suggestion to change a course of action.