Thanks for your feedback. We could have done a better job of conveying this but the green part of the meter actually shrinks the more dishes the player is currently carrying. Definitely something we'll revisit.
Perhaps you should check out the Gears of War reloading system. They have a great way of showing where/when you need to press the input. And you can even make it beneficial if the player gets a "Perfect" allowing them to move faster. Just a thought. :)