Mature milk not in 9 days post c-section

For context - I had an emergency c-section January 14th due to eclampsia. I am now 9 days PP and I’m getting hardly an ounce a breast every time I pump. I have tried power pumping, pumping after breast feeding, oats, drinking a beer (grandma swears drinking a beer will help supply). Just about everything I’ve seen online and I can’t seem to keep up with my little one’s needs. I am a FTM and I had ambitions of EBF and/or building a supply. Am I just being impatient? I know with c-sections, stress, high BMI can all delay supply. I would appreciate any tips, tricks, advice ❤️