You are ready at all times to go anywhere, and do anything.

Whatever the situation is, you have to be ready at the end to go.

We're ready at this end any time you need power.

That way, both will be ready at the same time.

I'm ready at this point to be able to put something in words that makes sense.

He turned, ready for his next go at the fence.

Power up all systems and be ready to fire at my command.

I may not be ready at the moment which you choose.

So, yes, he has to be ready at any moment.