The single-player campaign has been complete for months - rumor.
According to the site
PushSquare, the singleplayer campaign for the PS4 shooter has been complete for months. Director Steven ter Heide from Guerilla Games tweeted that he was starting
his campaign playthrough. When he was asked whether the single-player was
playable start to end in basic form, he said that it “has been for a
couple of months”. The tweets have been deleted by now, so take this information as a rumor.