I think these speeds are already there in South Africa. It's just that there are a lot of infrastructure factors to consider. Either distance from Exchange, Type of link (ADSL/VDSL) and other things like your internet package from your service provider. But getting actual 10Mbps on a 10Mbps Link on a 10Mbps Package, that i don't think anytime soon until infrastructure from Telkom gets improved.
Note: I'm assuming that the 10Mbps speed is on a fixed line connection. Because you can get more than 10Mbps on LTE & Fibre.