How to get LCP and FCP metrics on running a private instance.??

How to get LCP and FCP metrics on running a private instance.??

right now i'm installing webpagtest as npm package. npm install webpagetest -g

Starting the apache2 and chrome server

and executing the command webpagetest --server http://localhost test -l Test -r 1 -y Native www.facebook.com

i'm not sure out to get the FCP and LCP metrics out of these results.  Please some here help me