Three key metrics provide valuable insights into business performance and can be indicators for predicting future success. The first metric is "Treatment on the Books in the Next Two Weeks," which offers a glimpse of the gross revenue expected in the upcoming 14 days. The second metric, "Treatment Planned Dollars This Week," represents the beginning of the revenue funnel, tracking planned treatments that may turn into revenue in the future. The third metric, "Schedule Looking Forward," assesses how booked the practice is and informs decisions about hiring and marketing efforts. Dr. Addison Killeen also offers access to their spreadsheets and additional metrics on his website, providing practical tools for business analysis.