Hi there,
By default, Group Policy refreshes in the background every 90 minutes, with a random offset of 0 to 30 minutes. If you want to refresh Group Policy sooner, you can go to a command prompt on the client computer and type: gpupdate /force.
The following is a list of the Group Policy options available for configuring WSUS-related items in the environment. Configure Automatic Updates by Using Group Policy
https://learn.microsoft.com/de-de/security-updates/windowsupdateservices/18127451
If you do not want to define working hours you can have Windows automatically adjust active hours based on your device’s activity.
Get updates when you're away from your PC with active hours in Windows https://support.microsoft.com/en-us/windows/get-updates-when-you-re-away-from-your-pc-with-active-hours-in-windows-09b5376c-7647-4361-1423-c29aa692a8c4
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