Thanks for your posting on Q&A.
In my opinion, the build-in WSUS report could help. Please refer to the below picture to export the WSUS report to the Excel:
You know, we have to enter the specified condition(Any classification/Any product/Any computer group/Needed, failed, No Status) and click Run Report option to filter the specified report. I don't know the PowerShell scripts to filter out all the updates in the WSUS, include Update Status and Computer status and export to the Excel. Please consider sharing your specific needs and I will research further to see whether there are any PowerShell scripts could achieve.
Hope the above will helpful.
Thanks for your time.
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