There is no native ST capability for time based user lock codes and Rboy has not released a replacement for LUM in the new architecture. No-one has created another ST app that can do time based codes either.
Some people are using other third party solutions that support time based codes like Seam or lockmanager.io . Others are using Sharptools to add and delete codes at specific times to emulate the behavior formerly in LUM. @bthrock is using an app that is supported on the Hubitat platform and an Edge driver that can uses the ST APIs to synchronize devices between the two platforms (requires s Hubitat hub).