Wednesday is the actual meet, all this you are hearing now is the preliminary efforts to hammer out a " deal " ( whatever worth that is) . But , the reason the market is watching now is because were any deal to occur, it would need pretty much done prior to tomorrow so the vote could happen.
But, the real story is , there will be no cessation in pumping as SA and others see the writing on the wall for oils future and any oil that's not out of the ground and to market , may end up staying there eventually as it won't be worth the cost to produce.