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Which Celtic literary languages belong to the Goidelic group?

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An overview of the Irish language — Celtic literature Britannica editor Jeff Wallenfeldt provides an overview of the Irish language.

The Goidelic group, sometimes referred to as Q-Celtic, consists of three primary languages that originated in Ireland. These languages are:12

Irish (Gaeilge)
Scottish Gaelic (Gàidhlig)
Manx

These languages are distinguished from the Brythonic group—which includes Welsh, Cornish, and Breton—by their retention of the q sound (which later developed into the k sound, spelled c), whereas the Brythonic languages developed a p sound.132