These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] acct-group/ntp-0-r3::gentoo  0 KiB
[ebuild  N     ] acct-user/ntp-0-r3::gentoo  0 KiB
[ebuild  N     ] net-misc/chrony-4.9::gentoo  USE="caps cmdmon nettle nts phc readline refclock rtc seccomp sechash -debug -html -libtomcrypt -nss -pps -samba (-selinux) -verify-sig" 649 KiB

Total: 3 packages (3 new), Size of downloads: 649 KiB