Hello AC Question,
To ans ur qus ,If you r using Shealth 4.7/4.8 You will get Check for updates option in Shealth->More->Settings->About Shealth)
If you r using Shealth 5.0 ,you have to check in Galaxy App store or Google Play store for latest update.
You can frequently check these app stores as Samsung is releasing almost every month a newer version.
Thanks