I am planning to leave at 1:15pm. This allows for those on the commuter rail from South Station to arrive at Newtonville at 1pm and comfortably walk, if one is able, to the Starbucks nearby. The bus (553/554/556 from downtown Boston) to Newtonville also has a stop at Washington and Walnut that is close to the Starbucks. If walking is difficult, please let me know; I’m happy to explore and find another option that works for you.