When should a convert be baptized?

“How easily is this question decided, if we will take the word of God for our rule! Either men have received the Holy Ghost or not. If they have not, Repent, saith God, and be baptized, and ye shall receive the gift of the Holy Ghost. If they have, if they are already baptized with the Holy Ghost, then who can forbid water?“ ~ John Wesley

Baptism and the new birth

John Weslet’s journal, January 25, 1739 - I baptized John Smith (late an Anabaptist) and four other adults at Islington. Of the adults I have known baptized lately, one only was at that time born again, in the full sense of the word; that is, found a thorough, inward change, by the love of God filling her heart. Most of them were only born again in a lower sense; that is, received the remission of their sins. And some (as it has since too plainly appeared) neither in one sense nor the other.