When do updates appear on yum repo?

I'm new in using RHEL. I've noticed a new errata was released today: RHSA-2018:0260. But when I run 'yum update', there are no packages marked for update. The systemd package is still at systemd-219-42.el7_4.6.x86_64 and the new one is systemd-219-42.el7_4.7.x86_64.rpm.

Is there a delay when packages appear on the repo, or is there something wrong?