By my reckoning, it stands at:
SA 5 – 4 Eng
SA won the whole of the first day (3 sessions), lunch and tea on the 2nd. England won the first of Day 2 and the whole of day 3 (3 sessions). So it would seem that on points, SA are ahead even though England has caught up quickly. England are only, effectively, about 85-1 – so if SA can bowl them out for an effective 200 or less, they ought to win. Similarly, England will need to bat and win sessions 2 and 3 to set SA a target of 300+. Fascinating 4th day in prospect!