i would keep it staked for a bit
maybe unstake it for a while in low winds
to force it to strengthen the base.
i would just worry a little about high winds, uprooting or snapping.
i dont know that much about white sapote though
so i dont know if its a strong wood or not.
i have one about the same size, or a little larger,
and havent had any problems with it.
its kinda protected from wind though.