Welcome actor39
You do not actually need a static Qt build in order to deploy your application to another machine. The only thing a static build will get you, apart from the effort of building it and limitations it imposes, is a smaller number of files to deploy (maybe as small as one).
Have you been through this page? https://doc.qt.io/qt-5/windows-deployment.html
Addendum:
D'oh! Should have previewed before submitting.
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