Zombieload is considered the most dangerous
Fixing these issues requires more work than the typical update. It takes changes to both the microcode for the CPU hardware and also changes for the operating system of the device itself. Most OS developers including Microsoft have released their patches today. On the CPU side, Intel has already sent the microcode updates to the developers of motherboards and OEM firmware vendors. However, the end users will only get them in a future bundle of OEM firmware updates.
To make sure the patch has been applied, Microsoft has updated a PowerShell script earlier developed for Spectre for this newest round of vulnerabilities. Go here for complete directions on how to use it.