It might already be July but Samsung is still in the process of rolling out last month's security update to many of its lower end smartphones. As per the latest report, the June security update is currently being rolled out to the Galaxy Xcover 4 in the European Region via OTA. Although you probably know already, it's worth mentioning that this includes the original Android June SMR update from Google which contains fixes and patches for 96 bugs and loopholes, in addition to the Galaxy patch by Samsung which contains 23 exclusive patches for all Galaxy branded smartphones.
If you are in the European region, you should see firmware version G390FXXU1AQF8 landing on your Galaxy Xcover 4 anytime now. If you are not in Europe however, we are not sure when you are going to get the update as the handset was released exclusively in that region as far as I know. In case you already have the update on your phone, let us know in the comments about it.