Aristotle, of course, used a broader ontology of causes than is commonly used today, but there should be no confusion if we are careful to define what we mean. In particular, final causes are more commonly regarded as psychological attitudes, whereby if someone acts now to bring about a certain circumstance in the future, the circumstance is caused by what they were thinking prior to the action.
There is, likewise, no logically necessary reason to assume that that causal process of metabolism will continue to work tomorrow as it always has in the past, though it is indeed reasonable to prepare for that outcome as the most likely outcome.
If someone buys something to eat at breakfast tomorrow, but dies before then, there was no future event to cause the purchase.