(Again Apple released macOS and iOS/tvOS/watchOS updates simultaneously so servers may be swamped initially.)
FYI: the original (July 22nd) Security Update 2019-004 caused kernel panics after wake from sleep for many users. (Some said the problem affected T1 and T2 chip Macs.) Apple pulled Security Update 2019-004 for both OS's and rereleased it July 29th. (Initial reports on the revised update seem positive from those that had problems with the original release.)
Reminder to Users of Nvidia Web Drivers:
(There's been no Mojave Nvidia web driver updates yet, but a reminder to 10.13.6/10.12.6 users of Nvidia's web graphics drivers.)
New OS updates or later build numbers after Security Updates typically break currently installed Nvidia web graphics drivers. I'd switch to the default Apple driver and reboot before updating, if your card is supported with the default drivers. If not, wait for a Nvidia driver update. (Some non-Mac EFI cards are not supported by default OS X drivers.) Nvidia Driver Updates - July 30th/31st, 2019:
Info/Downloads of Nvidia Web Graphics Driver Updates for macOS 10.13.6 and macOS 10.12.6.
(These are driver updates for the July 29th rerelease of Security Update 2019-004 builds.)
iOS 10.3.4 release notes
(for iPhone 5, iPad (4th generation) Wi-Fi + Cellular)
"iOS 10.3.4 addresses an issue that could impact GPS location performance and could cause system date and time to be incorrect. This update is recommended for all users."
iOS 9.3.6 release notes
(for iPhone 4s, iPad mini (1st generation) Wi-Fi + Cellular, iPad 2 Wi-Fi + Cellular, iPad (3rd generation) Wi-Fi + Cellular)
"iOS 9.3.6 addresses an issue that could impact GPS location performance and could cause system date and time to be incorrect."
watchOS 5.3 release notes and security fixes.
- Provides important security updates including a fix for the Walkie-Talkie app.
- ECG app on Apple Watch Series 4 now available in Canada and Singapore.
- Irregular heart rhythm notifications now available in Canada and Singapore.