Verizon is now rolling out a new software update G928TUVU4EQJ3 on the Galaxy J3 Eclipse standard version and build number J727VPPVRU1AQK4 on the prepaid model. The latest patch comes with Android December Security patch and the Krack fix.
Android December Security patch addresses Common Vulnerabilities and Exposures (CVE) in the open-source Android OS.
The patch will gradually release to everyone. You can also check manually for updates, go to Settings > About device > System update.
Make sure you have enough charge on your device at least 60% to 70% before downloading the update.