@HiD just released the first version of dOPUS, his NSP/XCI manager for the Switch! It is based on Tinfoil and 4NXCI.
Currently, the existing XCI/NSP tools either need a PC or can only do one or the other, but now scene developer @HiD has released the first version of dOPUS and it can manage both NSP/XCI installs directly on your Switch console itself. You can grab it here!
NEWS SOURCE: dOPUS 0.6 - NSP/XCI file installer and manager (via) GBATemp