I finished up a BT with the final payment in June. My card is on a zero-percent purchases year that expires in August, so no interest on purchases, Q2 wasn't interesting, ended up never using it for gas, other cards give points on Lyft/Uber. Card went to zero for that June 17 statement.
I started using the Discover again for dining, and first transaction was 16 July, for $1.20. The statement date is 17 July, and since the $1.20 was the only amount that posted, the statement printed with a Small Balance Credit immediately provided, zero due. There was nearly $7 of Pending transactions on 16 July also, but those were disregarded in the automation to zero the statement amount.
Discover acts pretty quickly.
High Bal Jan 2009 $116k on $146k limits 80% Util. Oct 2014 $46k on $127k 36% util EQ 722 TU 727 EX 727 April 2018 $18k on $344k 5% util EQ 806 TU 810 EX 812 Jan 2019 $7.6k on $360k EQ 832 TU 839 EX 831