Assalamu alaikum Sheikh. 1. Is it permissible to do delivery work in the U.S. when some orders may involve pork? 2. I’m overseas and financially support myself,Is it haram to delay marriage until around 26 while I finish my engineering degree, since marrying now would be difficult financially?

If you do not know what is inside the order then it is allowed, and if you know it contains pork or alcohol then do not take that order. As for marriage, you are not sinful in waiting while you are genuinely unable, and the Prophet ﷺ said whoever is not able, let him fast. Also, a major deciding factor is whether it is affecting your religion and causing you fitnah not to get married or to do so.