If you have approved Windows updates on your WSUS server but do not see the Yellow Window updates icon when you logon to one of your servers or client machines, you can run the below command to force the detection and download of approved updates.
1) Click start
2) Click run
3) Type cmd and click ok
4) Type the following: wuauclt.exe /detectnow
5) Press enter
6) You may need to wait around 5-10 mins before the icon will appear