Ostriches wouldn’t eat eggs, they’re herbivores. And that looks more like a secretary bird which would definitely eat eggs since they’re carnivorous secretary bird
Herbivores eat a lot more meat than we're led to believe. Horses and cows will eat mice and bugs if they get the chance, and just about any animal will happily eat an egg they stumble across
The bird in the picture also has a raptor's break, so whatever it is it's likely a predator
