Sprint's LG G3 today becomes the newest member of the Lollipop club. We had a leaked document from Sprint a few weeks back that pointed to today as the big day, and indeed it is. You may begin attacking the update button now.
The OTA is rolling out with the following changes.
Sprint didn't clarify whether the update was going out in waves or if anyone could manually trigger the OTA by checking for updates. It can't hurt to try... a few dozen times.