Your father would only use the I-864a if he doesn't qualify on his own as s joint sponsor, and needs to combine income with you, in order for there to be enough income. Line 9 is the total income you would report for 2025 and also what you would state as your current income, for a self-employed person. I take it you are self-employed with Uber, not an employee. Your income is sufficient on its own. Yes, you can do the 864a from Dad later, if it becomes necessary.