Muni is scheduled to give an update during its board meeting Tuesday.
RELATED: San Francisco streets filled with chiming music from Muni cable car bell 'ring-off'
ABC7 News has learned the Powell-Hyde route will be the first to resume service sometime this fall.
Cars will run from 11 a.m. to 7 p.m.
RELATED: Here's what Bay Area transit leaders are doing to prepare for return of San Francisco workers
The system needs detailed maintenance before cars can go back into service.