With WAAS, you do not need a RAIM check for LNAV/VNAV approach, LPV approach.
AFAIK, you still have to RAIM check for RNAV RNP. The HPL/VPL need to be checked.
RAIM checks are no longer required unless you lose WAAS coverage. With WAAS, the receiver can now be used for primary navigation. But these receivers, certified under TSO C146, must still check for integrity of your GPS position solution, and this check is more sophisticated since there are new integrity requirements for approaches with vertical guidance that are more stringent than for LNAV approaches.