Yeah, I agree with Chlorophyllum or (less likely) Macrolepiota, but I'm unfamiliar with which species grow in your part of the world so you'd need a local field guide to nail it.
This looks like a cross in between Macrolepiota Procera and Chlorophyllum Molybdites but this grows in Africa and if C. M. has green gills, this one has white gills. The top of the cap looks like CM and the gills like MP. Both of these mushrooms would have the size you described, even bigger.
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