Seeing as how several entire industries are 100% run by Coptic Christians in Egypt (those things that Muslims will not touch for religious reasons: pig farming, wine production, etc.), I'm going to guess quite a bit, at least relative to our size (~10% of Egypt). I couldn't find more recent numbers, but for instance in Manshiet Nasr (Christian suburb of Nasr City), in 2014 they were rearing 50,000-80,000 pigs, which was down from a high of 350,000 in 2009 -- the year the Mubarak government decided to outlaw pigs and destroy the existing livestock (see
here). Elsewhere in the country, further from the capital, the percentage of Christians is much higher, and they are mostly poor farmers, so chances are greater the further south you are from Cairo that your food or produce will be the result of a Christian's work at some point in the distribution chain. (And in the USA, anecdotally I can say that when I was in NY staying at the monastery of St. Shenouda, I saw them bring food to the homeless myself. I doubt that's something only they or churches within their diocese are doing.)
What any of this has to do with your church being a bunch of greedy investment banker types, I don't know. I don't recall anyone ever claiming that the LDS corporation doesn't have its charitable arms, so that's a non-sequitur if there ever was one, though I
do remember once
comparing the LDS' charitable giving to that of Christians more generally in the USA, and it not coming out looking too good for the LDS.