WebP images not showing

Hi all,

I double checked all settings but I couldnt solve the problem.
In my site images shows as jpg or png. I want them changed by webp.

What can be the possible mistake i am doing?

Thanks for all replys.
No i checked it in Chrome. I am sending new requests in the image optimization section but stats not changing in Optimization Summary

Total Reduction: 474.48M
Images Pulled: 40105
Last Request: 05/18/2019 13:20:02