mate-applet-softupd from X11:MATE:Factory project
Select Your Operating System
Add repository and install manually
For Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:MATE:Factory/Factory/X11:MATE:Factory.repo zypper refresh zypper install mate-applet-softupd
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:MATE:Factory/15.6/X11:MATE:Factory.repo zypper refresh zypper install mate-applet-softupd