How To Tell If Varnish Is Working

I installed varnish by selecting Nginx > varnish > apache setup on webservers. I made sure to enable it on the domain I wanted on the config. Now i'm not suring if it's working or not, I tried to verify by checking the header and could only see Nginx. If I put varnish port directly I see Varnish on the x-header. When using Nginx > varnish > apache, should I  see Nginx on header or Varnish on x-cache? Right now im seeing the following

Server: nginx/1.16.1
X-Cache: HIT from Backend


Thank you.