looking at the last two paragraphs "Detailed engineering was...

looking at the last two paragraphs "Detailed engineering was currently under way on the project and Molefe said that the group planned to “hit the ground with picks and shovels in March or April next year”.
Expanding access to the Waterberg would be conducted in phases, with an initial plan to upgrade the link from the Waterberg to Mpumalanga using existing infrastructure. At a later stage, a heavy-haul operation could be introduced, integrating both the Waterberg and Botswana coalfields. "

I don't think this time frame is going to have much impact on WKT exporting coal. probably 10 to 15 years before Botswana gets linked in, especially if they are only going to use picks and shovels to do the earthworks (he's not joking)