MicrosoftMicrosoftmyry1 Once the required update is available then it will likely be posted to the device update service quicker than in the past given the potential impact.
That being said, Microsoft has ceased their device qualification program for Skype for Business Online, so any new firmware updates beyond this change will be certified, and likely the Device Update services online will continue to push the current versions until SfBO retirement in July 2021. (An exception would be if one of those releases was found to have a critical security flaw in the future and would need to be replaced with a patched version, but even then it's quite possible that Microsoft just decides to disable the update service in general. In short, it's always recommended to manage device updates in a different manner and disable the in-band update process as Adam mentioned earlier.)
Newer releases may still be able to qualify for Skype for Business Server, but Microsoft does not manage those updates, the customer does in their own deployment.
