Hi @Ashok Sodhey , welcome in community
If you have already purchased and successfully enrolled your PC in Windows 10 ESU, you normally should not have to wait a specific number of days. Once the device is properly enrolled, it should begin receiving the Extended Security Updates through Windows Update.
If the updates are not appearing, make sure that Windows 10 is version 22H2 and that the required ESU prerequisites are installed. It is also worth restarting the PC and manually checking for updates under Settings > Update & Security > Windows Update.
If ESU enrollment is correctly completed, I would not expect you to have to wait several days. If the security updates still do not appear after restarting and checking Windows Update manually, there may be an issue with the ESU enrollment, licensing, or one of the required prerequisites rather than simply a delay in receiving the updates
Let me know what you found
Elvis