Has the KSK rolled?

YES: the root DNSKEY is currently signed by key tag 20326 (KSK 2017) (cached)

The next KSK rollover is planned for October 11, 2026 (with revokation of the current key on January 11, 2027). Announcement

The last root KSK rollover took place on October 11, 2018 at 1600 UTC. More information