Players who reach Chapter III in the Season Journey (for Season 7) have hit Level 70 and more than likely have started working on their Paragon Points. Players start Chapter III with two of the set pieces offered by Haedrig’s Gift this Season.
I started Chapter III with three out of its ten objective already completed. I had no idea what Chapter III required. It’s possible to complete objectives for upcoming parts of the Season Journey just by playing the game and doing things you typically would do.