When checking the top lists on the IAAF website you can manipulate the selection. On the "filter" list in the third column "AREAS/COUNTRIES" select the drop box, default is world. Play around with the selection for breakdowns. The South African times are normally update within a week.
As I mentioned in a previous comment he as a standby lane for the Shanghai Diamond League on 18 May. He will fly to Shanghai in case a lane becomes available. He is also running in the IAAF world challenge in Nanjing on 21 May. He is in Yokohama for the world relays on 11 and 12 May. By te way the SA relay team ran a 38.88 tonight in Bloemfontein.