Ordinance 114-20, passed as an emergency ordinance, re-enacts its predecessor Ordinance 68-20 to suspend the annual allowable rent increase for 60 days, per Section 2.107 of the San Francisco Charter (unless re-enacted again).
According to Section 2.107, an emergency ordinance is effectively immediately upon passage (which, for this ordinance was July 7, 2020). However, Ordinance 114-20 states that it is instead effective immediately after the expiration of Ordinance 68-20 (which is likely because the first emergency ordinance expired on June 23, 2020, before it this one was passed.
When in doubt, follow the charter. Ordinance 114-20 probably expires on the 61st day after passage – or September 6, 2020.