I think 100+ games across CF/LF and some RF if there is a DH is probably about where I would pencil him in on a roster right now. I think the Phillies like him and like him more than the other OF (Moniak and Haseley are also probably behind Muzziotti at this point on the depth chart as well as prospect wise) so I think he makes the team unless he sucks in Spring Training. But back to the larger point, lets say they sign Schwarber and trade for Kiermaier, you know KK isn't going to play all 162 and the Phillies are likely to use the DH on rotating rest so you would expect Schwarber, Harper, and Hoskins at least in this scenario to get a lot of time there, so you then have Vierling as your "plays the position the DH normally plays", OF injury backup, and LF defensive replacement. That looks like 100 games and like 400+ PAs to me.
Also on the roster front, they need some of the Maton, Vierling, Moniak, Haseley, Muzziotti, Williams group to make the opening day roster to make the 40 man work. I expect they may try to trade some of them, but they need 2 of them to make the opening day 26.