With the century in the IND vs SA 1st ODI, Virat Kohli now has 83 international centuries total - 30 Tests, 52 ODIs, 1 T20I.
He now needs 17 more tons to reach the 100-century milestone. But he has only ODIs left after retiring from T20Is and Tests.
India has roughly nearby 35 ODIs counted through the end of the 2027 World Cup group stage (confirmed fixtures + group matches). Knockouts or additional series would add to this total.
He needs 17 tons in 35 games. This means he would need to score a century in almost one out of every two matches he plays for the next two years.
His career ODI rate (0.1706 centuries/innings) projects only ~6 centuries in those 35 matches.
The only way the chances rise is if India plays more ODIs or Kohli hits a historic purple patch.