Check With IT
If you use your device for work you might want to check-in with your IT team, if you have one, and make sure you've got the green light to install iOS 12.4.5.
Enterprise problems plague every single version of iOS and they can be particularly nasty in the days after a new iOS release.
If you depend on your device to get you through work (or school, for that matter) it's important to get in touch with IT to see if the iOS 12.4.5 update is safe for you to use.
Your IT team should able to provide you with valuable feedback about the apps and services you use and, perhaps, iOS 12.4.5 itself.
If you don't have an IT department or a tech on-site, you'll probably want to ask around the office and gather feedback about the apps and services you use the most.