Comment from Anthopoulos. Foltynewicz won't be ready to start the season.
After the opening series with us the Braves play 3 vs the Cubs, 3 vs the Marlins, 3 at the Rockies and 4 vs the Mets to start the season.
In an ideal world for the Phillies he would miss the games vs the Cubs, Marlins and Rockies and return to beat the Mets. It definitely seems likely he would return ahead of the Mets series, though how early is unclear from this video.