Hi, I need to access the data through wishbone but I am confused with how to read the data out through wishbone(wbs_data_o) I have already enabled the wishbone in C code.. anyone please help

How is the wishbone interface defined in your user project? You presumably have one or more registers located at an address in the user project memory map space. You would just need to read from that memory address.

Here's an example project with RTL and firmware

Will try it and update.