Bentmountain, we understand how important updates are. The last update was in February. You can stay update to day with software here https://www.verizonwireless.com/support/software-updates/. In the meantime is everything okay with your phone?
Unfortunately, security updates are more than just "everything (being) okay with your phone". They are just as important as (and probably more important than) functional updates affecting the usability of the device. Just ask Equifax about the effect of unpatched systems on their customers, their reputation, their stock value, etc.
Samsung releases security updates for Android OS related security issues released by Google as well as patches for Samsung-specific security issues on a monthly basis for "current" models (defined as Galaxy S series (S9, S9+, S8, S8+, S8 Active, S7, S7 edge, S7 Active, S6 edge+, S6 Active), Galaxy Note series (Note 8, Note 5), and Galaxy A series (A5 (2016), A5 (2017), A8 (2018)). The updates are dated the first day of each month, and they are typically released (i.e., made available to carriers) by Samsung within a few days (reference https://security.samsungmobile.com/workScope.smsb).
Verizon definitely has the latest (dated 1 May 2018) as they have already released updates on 23 May 2018 for both the Galaxy S8 and S8+ including Android® Security Patch Level of 2018-05-01:
The security updates released by Samsung to the carriers are OS-specific, not device specific. Every other "current" Samsung device supported by Verizon Wireless has security updates newer than those on the Galaxy S9 and S9+ (dated 1 February 2018).