It's time
Examples
A man in love is like a clipped coupon - it's time to cash in.
It's time for the human race to enter the solar system.
I'm the one that has to die when it's time for me to die, so let me live my life, the way I want to.
A lame man always speaks when it's time to run.
When it's time to fry the beans, you can't do without lard.
When your friend gives your wife an expensive present, it's time to get suspicious.