Microsoft have provided a Powershell tool for checking and reporting on an individual Windows computer.
Press the Windows key on your keyboard and type PowerShell – when you see the shortcut appear in the search results, right click on it and choose Run as Administrator.
Quick Instructions
To install the module type
Install-Module SpeculationControl
You might get prompted to install the NuGet provider. Type Y and press enter. If you’re asked about installing from an untrusted repository do the same thing again.
Once the module installs type
Get-SpeculationControlSettings
If you see messages about execution error you can type
Set-ExecutionPolicy BypassReferences
Microsoft have released an article explaining the output of the tool.