We just got Purple Carrot (non-TB12 this week) this morning. They currently arrive very early, so very fresh. Delivery over the months/years for each service has varied. Early morning arrival is best. Gobble used to arrive early, but was very late for awhile and is now late afternoon/early evening. Sunbasket just changed their delivery day to Monday for us, so we'll see what time of day we now get it. So for freshness, you might need to try several services to see who currently has a good delivery for you (but keep in mind it can change).
We switched to the non-TB12 menu this week because they have corn risotto on the regular menu. TB12 had it recently with roasted artichokes and it was delicious (although I wouldn't call it a risotto, personally)!