Today's update to the Sprint model of the HTC 10 includes one and only one change, according to the log on Sprint's support page. "Bug Fixes - includes Camera enhancements" is the only line on note. According to the post the update is version 1.80.651.1, the same one mentioned on this HTC page, which means that it also includes the AOSP security updates for both May and June. The RUU for the update, which weighs in at a hefty 1.8GB, is available for manual flashing.
This is a similar update to the one given to the Verizon version of the HTC 10 last month, though the version numbers don't match, so there are probably a few different tweaks on top of the June security patch. Sprint says specifically that the rollout will begin and end today, June 21st, so this might be that oh-so-rare OTA where every user can get it right away.
You know the drill: check your Settings menu to try and initiate a manual download if you haven't spotted the notification already. HTC is also offering a PC download through its Sync Manager program if you don't have easy access to Wi-Fi and you'd like to avoid data overages. Happy flashing.