Approved! similar timeline to some of you above. Timeline:
Application approved – 10:18am on 7 February 2022
Documents received – 11:15am on 31 January 2022
Application received – 10:16am on 20 January 2022
Application submitted – 10.16am on 20 January 2022
However… Royal Mail stated documents received by Passport office 8.52am on 21 January.. but did not show on Gov tracking as received until 31 Jan, it was during this time I was starting to panic!