List binaries in profile:
find /run/current-system/sw/bin/ -type l -exec readlink {} \; | sed -E 's|[^-]+-([^/]+)/.*|\1|g' | sort -u
Output format:
gnugrep-3.3
gnumake-4.2.1
gnupg-2.2.17
…
Remove the bin/
suffix in the above command to list all drv outputs used in the profile.