Fallout players on PC have had access to mod support for the past few weeks; the Creation Kit entered a closed beta in early April, followed by an open beta that same month.
Though still undated, the Creation Kit update is planned for consoles in May (on Xbox One first) and June (PlayStation 4).
Far Harbor, the next Fallout 4 expansion, launches on Windows PC and both consoles May 19, so Xbox owners can expect the Creation Kit to arrive sometime thereafter.
In a tweet, the company confirmed that mods will arrive on the console versions of Fallout 4 in a closed beta for a public release.