Where the rubber meets the road
Definition 1 of 1
Pro Tip 1/3Action Point
The phrase often highlights when plans must be executed, not just discussed. 
We've strategized for weeks, and now, where the rubber meets the road, we'll see results.
Pro Tip 2/3Reality Check
Used when facing the truth or practicality of a situation, separating ideas from facts. 
Theory is great, but where the rubber meets the road, we'll know if it works.
Pro Tip 3/3True Test
Indicates a situation that truly tests a concept or a person's abilities. 
Her leadership will be where the rubber meets the road during the crisis.