Problem:
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WSUS all client computers Has been in the status of [Not yet reported]
Reason:
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Due to the SCCM After the software update point is enabled, WSUS is fully taken over. WSUS cannot receive detailed installation progress reports when the report event that WSUS is not selected in the configuration. The management of client reports will be taken over by SCCM 
Solution:
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Configure SCCM [Software Update Site Components] Enable [Create All WSUS Report Events] Configure from [Upstream data location (URL) synchronization] resume normal 
processing result: need to wait for all clients to report normal