Isn't it? The release files are available at: https://github.com/eduperez/mwlwifi_LEDE/releases, and the post in this forum is: Pre-compiled updated mwlwifi drivers for stable releases; both seem available right now.
However, you will notice that there aren't packages for 18.06.2, as the drivers included the latest stable build are up to date versions; and as far as I can remember, there have been no announcements about signal strength improvements during the lifetime of these drivers.