https://www.youtube.com/watch?v=62ASvupr8Zg
It's a massive logistics challenge and it would require an unprecedented level of cooperation between Saharan nations and given how unstable the region is as of current... I'm afraid it's not happening for another 30-50 years, when climate change will probably corner these countries or their rich neighbors living further north. That being said, Australia is a better candidate to this due to it being a single country and a very stable one at that...
Once Australia proves the concept, Africans can follow suit, and we'll build solar arrays over the oceans, and then we'll become a type 1 civilization.