"See how it flies" is a phrase that can be used to describe observing how something progresses or how it turns out. This phrase can be interchanged with a number of synonyms, including "watch it unfold," "see how it pans out," "follow its progress," and "watch it develop." Each of these phrases conveys the idea of observing something as it evolves or changes over time. In a business context, for example, a leader may say "let's see how it flies" when launching a new initiative, meaning they will closely monitor how it is received and adjust their strategy as needed.