gov.uk/guidance/dvla-corona … pplication
Gives you the dates they are processing. Look for renew vocational licence. Today its 12th July. I sent mine in early August and only recently had a text saying its been received.
Section 88 is automatic as long as you’ve not been advised not to drive or don’t believe you have a medical condition which you believe could cause your licence to be suspended. Only applies also if you previously had the category, eg: not previously suspended.
You don’t need to do anything so no forms.