Info courtesy of user SBS9888Y:
SBS9888Y on S88 (Duty 44E timings):
T2 1220
T1 1338
T1 1356
T2 1513
T2 1527
T1 1649
T1 1717
T2 1838
T2 1846 (Jump bus, P-shift)
T1 indicates Pasir Ris Int
T2 indicates Toa Payoh Int
Happy catching! :D
SBS9888Y on 88 (AMDEP 133)

SBS9888Y replaces SBS9083C that operated in the morning E, it
will jump to a P Shift after 1846 and 44E shift BC
ends shift at Toa Payoh Int without sending any buses back to
the depot.