Hi @UnXpected The stable release of One UI 5.0 is scheduled to roll out to the Z fold 4 at some point in November. see the list here https://www.sammobile.com/news/samsung-one-ui-5-0-update-release-schedule/
The Beta is only available for unlocked non Branded devices,would not be possible if you received the phone via a Vodafone contract.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .