Exact status is of course hard to determine, especially with open sources, but see the Hwasong-14[1] and 15. Both missiles have flown on trajectories demonstrating enough performance to reach the USA, and at least the Hwasong-14 has been displayed on a Transporter-Erector-Launcher.

(Also, I hope you remember that they've got nukes now, partly courtesy of US domestic politics counting above mitigating real world problems)

No doubt the North Koreans still have a lot left before reaching the operational capability of the Russian road mobile ICBM forces, particularly with respect to accuracy and reliability. But nuclear weapons are not that picky with aiming, and numerical redundancy is certainly within the North Korean capability.

[1] https://missilethreat.csis.org/missile/hwasong-14/