I submitted my application on 8th September.
They received my passport on 15th September (even though I did next day tracked delivery).
It stayed like this for 3 weeks and I was getting very worried as I’m going away in 2 weeks time, I called up today and they added a note to my application saying I was going away for work and then 2 hours later I had an update saying my application was approved! I don’t know if it was a coincidence but it’s worth calling up if you are getting very stressed about it like me!