I always order PDF copies now, for family history they don't need to be certified copies. They arrived as quickly as usual.
I think there is a problem with GRO anyway, apparently there are 1000s of births that haven't been registered since lockdown. The registrar offices closed and are only just opening but appts. have to be made and they are starting to register the babies born last March. So my g.grandson born late on Wednesday night, may not have his birth registered for some time.