Full article below, it seems the employee called 911 and not the specific tip line and in NYC this results typically in not getting the reward. The FBI side is dependent on a conviction and some fairly significant bureaucratic paperwork so again many people don't get federal rewards for years if at all.
https://www.unilad.com/news/us-news/luigi-mangione-ceo-shooting-mcdonalds-worker-reward-333982-20241210