One thing to keep in mind is that lab-grown meat would still need to be "fed".
The conversion from feed to useable meat may be more efficient but we would still need to grow animal feed and to actually process it more than we do now: A cow can eat hay, but lab-grown meat will need that to have been digested to ready to use at cellular level.
I can imagine than lab-grown meat will always be more expensive than 'normal' meat because of the tech involved and because animals grow themselves but I don't think the aim of lab-grown meat is to be cheaper.
The conversion from feed to useable meat may be more efficient but we would still need to grow animal feed and to actually process it more than we do now: A cow can eat hay, but lab-grown meat will need that to have been digested to ready to use at cellular level.
I can imagine than lab-grown meat will always be more expensive than 'normal' meat because of the tech involved and because animals grow themselves but I don't think the aim of lab-grown meat is to be cheaper.