Upgrade query

Dear Team,

Currently we are running below version of software/products in our environment. We are planning to upgrade our vCenter Server environment to "vCenter Server Appliance 6.0 U3f - Build Number – 8874691."

- Current version of vCenter, PSC and NSX Version

VC  Version 6.0.0 Build 5318172

PSC Version 6.0.0.30200

NSX version 6.2.6 Build 4977495

For upgrade activity I'm referring below LINKS/URL , Just wanted to know Am I referring the right artcile

Understanding the PSC upgrade workflow in the link below:

https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.upgrade.doc/GUID-CB1C7FF6-A184-4DFF-81A3-35E2C3B5FEE0.html

Please find a similar link for the vCenter Server Appliance in the link below:

https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.upgrade.doc/GUID-37BB88CC-7A44-4EC9-8D7B-5D182E471654.html

Also wanted to know how to check What was the size selected when the appliance was first installed ? Request you to asisst me on the same.