If the filter is a P-100 rated filter, it should. full face protection helps keep you from getting the virus in contact with facial openings (nasal, oral, eyes) as well. "it should" -- In theory, during the time that the mask is fit properly and undisturbed, but all of us have seen that even a full containment suit is no guarantee in the field.
There are always failures, but most often they are believed to result from improperly removing the PPE and becoming contaminated in the process. Decontamination, multiple layers, are all efforts at prevention, but being isolated from the pathogen or substance is the only real protection. Nothing is 100% safe.
Where I work we do 'fit' tests for masks, despite positive pressure demand regulators. (H2S safety, not pathogens)