I have linked my zerodha demat to incred money for buying unlisted shares. after buying shares will they get automatically credited to my zerodha or should wait till they be listed?
Yes they will.
Also, since these shares are illiquid, sometimes, you can see a major price different between sellers. Do always compare Incred money with Precize and Unlisted Zone. I have seen spreads of upwards of 5% in some cases.