gpserror
https://gamboool.com/wynn-las-vegas-parking-information-and-directions-to-the-self-park-parking-garage-and-valet (NOT official) says it used to be $21/2hr, $30/24hr but they have dropped the fee probably to encourage casino traffic.

https://www.wynnlasvegas.com/about-us/parking has no information about the fee.

Would still be nice with on-ground verification.