Here scribe 2 of 𝓟 initially wrote the expected modern English verb form comes rather than the biblically styled cometh. His correction was immediate: he overwrote the s with the t and then wrote the h inline. Although there are a few instances of comes in the original text, the text uniformly has cometh (not comes ) when referring to Christ’s coming (17 times), including the following nearby example in Alma 5:48: “and behold it is he that cometh to take away the sins of the world”. For further discussion, see under infl al endings in volume 3.
Summary: Maintain in Alma 5:50 the verb form cometh, the immediately corrected reading in 𝓟 (“yea the Son of God cometh in his glory”).