This idiom or expression means:

You must decide now.
You can’t wait any longer.
It’s time to make a decision.

This idiom or expression has to do with:

Making a decision.
Reaching a conclusion.

A. Why are you smiling?
B. I’ve come to the conclusion that we’re both idiots!

This idiom or expression means:

We don’t know yet.
It hasn’t been decided yet.
A decision hasn’t been made yet.

When someone says “The jury’s still out on the trip,” they mean something like “We still haven’t decided if we’ll go.”

This idiom or expression has to do with:

Deciding.
Making a decision.

A. Have you decided what you want to do tonight?
B. No, I haven’t. I can’t make up my mind!!