Watch me post this and then they announce something at Thursday at 4pm. But I've noticed the trend for the last couple years has been Monday-Wednesday announcements for most of the bigger, established bands, followed by additional promo/announcements/merch/etc on the Friday. On Spotify and Apple Music (probably other services too, not sure), Release Radar playlists of new music from the last week drops on Fridays. A lot of bands have been moving to a system where they announce songs early in the week and gather a lot of organic plays from the big fans, so the song already has some traction when it's promoted to more casual fans, or maybe people who don't even listen to GNR but listen to a lot of rock. Foo's, Metallica, and Chili's all took that strategy. For instance, Lux Aeterna already had over a million plays by Friday when Metallica released it on the Monday, and it didn't hit playlists auto-generated for users until the Friday of that week.