This seems to be the latest information.
Based on the very last paragraph it may seem priority or super priority could be available again. Mind you, the 5 working days or 48 hours is only after the UKVCAS appointment, not after the application is submitted online.
https://www.gov.uk/ukvcas
UK Visa and Citizenship Application Services
When you apply for a visa, settlement (‘indefinite leave to remain’) or citizenship in the UK, you’ll usually need to use UK Visa and Citizenship Application Services (UKVCAS).
Use UKVCAS to provide:
your biometric information (fingerprints and photo)
supporting documents for your application
You’ll be told if you need to use UKVCAS when you apply.
What you need to do
You’ll need to attend an appointment at a UKVCAS service point to provide your biometric information.
You can provide your supporting documents either by:
uploading them into the UKVCAS online service
having them scanned at your UKVCAS appointment
Your immigration status will not be negatively affected if you cannot or do not want to attend an appointment because of coronavirus (COVID-19).
If you have not made an appointment
You cannot currently book an appointment at a UKVCAS service point because of coronavirus.
You must still create a UKVCAS account when you apply. This is so you can be contacted when new appointments become available.
Contact the Coronavirus Immigration Help Centre if you’re a critical worker, for example you work in a hospital or as a carer.
Coronavirus Immigration Help Centre
CIH@homeoffice.gov.uk
Telephone: 0800 678 1767
Monday to Friday, 9am to 5pm
Find out about call charges
If you have already made an appointment
If you’ve already made an appointment to attend a UKVCAS centre, you’ll be contacted and told what to do next.
Service point locations
The following service points will be open from 1 June:
Birmingham
Birmingham Premium Lounge
Chelmsford
Croydon
Exeter
Leeds
London Mark Lane Premium Lounge
London Victoria
Manchester Fountain Street Enhanced Service Point
Manchester Premium Lounge
Sheffield
Southampton
If your nearest service point is closed because of coronavirus
You might be offered an appointment at another service point if the one nearest to you is closed because of coronavirus.
If you cannot or do not want to attend this appointment, you can ask to wait for an appointment at a closer service point. This will not affect your immigration status.
How much it costs
You may need to pay a fee for your appointment, depending on the service point you choose. There are:
6 free ‘core’ service points
50 ‘enhanced’ service points
Depending on the service point, you’ll also be able to pay for:
out of hours or weekend appointments
extra services, for example document translation or an interpreter
Fee for giving biometric information
It costs £19.20 to give your biometric information if you are applying to extend your visa or switch to another visa while already in the UK. You’ll pay as part of your application.
Your appointment
When you go to your appointment, you’ll need to bring your:
appointment confirmation email (either a print-out or a copy on your phone or tablet)
passport or travel document
other supporting documents (unless you’ve already uploaded them online)
You’ll get a list of supporting documents you need to provide when you submit your application.
Family members
If your application includes family members, you must all go to an appointment together.
Children under 16
Children under 16 must go to the appointment with the person named as the ‘responsible adult’ on their application.
The responsible adult must bring photo ID with them. This must be a:
passport
photo driving license
national identity card
UK Biometric Residence Permit
If the responsible adult is not the parent or legal guardian (for example they are a member of staff from the child’s school) they must also bring written proof of responsibility for the child from:
the parent or legal guardian
a registered foster carer or social services representative
Getting a decision
You will not get a decision on your application at your appointment. How long a decision takes depends on what you applied for.
You may be able to pay for a faster decision when you apply.