Example VCF 3.8.1 -> 3.9 upgrade
In order to check the availability of Update/Patches from within the SDDC manager console navigate to Inventory->WLD->Update/Patches. In this example we see that VCF 3.9.0.0 update is available.

Expanding the Current Versions tab we see the list of components deployed as part of VCF and their respective current running code versions.
The following is a very useful VMware kb article detailing the BOM for each VCF release:
Correlating VMware Cloud Foundation version with the versions of its constituent products
In relation to this particular example upgrade of 3.8.1->3.9.0 we can correlate from the above kb the components being upgraded are:
- SDDC Manager
- NSX-T (Not applicable in this example as running NSX-V)
- PKS (Not applicable in this example)
It is also advisable to read the release notes of the target version prior to performing the upgrade:
VMware Cloud Foundation 3.9 on Dell EMC VxRail Release Notes

Downloading the VCF 3.9.0 Bundle:
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After the bundle has downloaded click View Details which details the version changes that will be applied as part of this bundle upgrade:

Running the Precheck to validate VCF is in a healthy state before proceeding with the upgrade and viewing the status of each component by expanding their respective results:
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Proceeding with the update, clicking on View update activity to monitor progress and track progress via the lcm log:
tail -f /var/log/vmware/vcf/lcm/lcm.log
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Confirm successful update via SDDC manager ssh console:
cat /var/log/vmware/vcf/lcm/lcm.log | grep “reached final state COMPLETED_WITH_SUCCESS”

Current running versions post VCF 3.9.0 update:

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David, This is incredible. Do you have similar steps for 3.9.0 to 3.9.1 ? Thank you, much appreciated!
Hi Babu, thanks for the feedback. I will post a VCF on VxRail 3.9.0 -> 3.9.1 post in the coming days.