
It's unclear if the update has started rolling out yet, but Sprint's support page says the rollout is slated to begin today, with the update carrying build number N910PVPU1BOB7. Like the T-Mobile variant, Sprint's version of the Note 4 will get the usual features of Lollipop and also receive Wi-Fi calling enhancements.
Keep an eye out for the notification for the update on your Galaxy Note 4; you can see if the update is available right now by going into the Settings » About phone » Software updates menu and hitting the Check now button.