Usually it has been observed that the price of adjusted share is more than where it should have been adjusted.
See the example of BHARTIARTL before it got split in half, it closed at 814 but opened at 419 on the split day that is 2% higher than where it should open (814/2=407) , thats not all it went all the way to touch 426 which is 4% advance only to settle at 416.. still in gain.
The story didnt stopped there followed couple of days are usually rally. Another benefit you have is that the stock become more liquid and more participants can play with RIL now as it comes to half the price.
Now see the other side market makers rally the price of stock to new highs just 3 days before the ex-date. On 21 Jul, BHARTI made MONTHLY high of 864.50.. so it could be better to Buy Today and Sell Tomorrow stock or trade in Future & Option so that you can liquidate your position.
May be Buy Today or Tomorrow and Sell on Wednesday and then again buy on Friday if you intend to play for a longer term.