openSUSE Tumbleweed is a great rolling release. Unfortunately, upgrading with Zypper can be slow and there can be hundreds of packages to download. Oftentimes, it’s more convenient to download the packages to be installed later. This is possible using the --download-only flag:

$ sudo zypper dup --download-only

Running Zypper like this will appear as a normal distro-update command, but will stop after the packages are downloaded. Later, you can run dup again and the pre-downloaded packages will be installed