Day One Fallout 76 Patch is Larger Than the Main Game; Weighs in at Roughly 51GB
https://wccftech.com/day-1-fallout-76-patch-size/
It appears that the Day One Fallout 76 patch will actually be larger than the main game.
As spotted by PSU, the day-one patch for PlayStation 4 owners clocks in at a whopping 51GB, while the download size of Fallout 76 is ‘only’ 45GB. In total, Fallout 76 owners on PlayStation 4 will need around 96GB of free space to install Fallout 76 and its day-one patch.
