This is a particularly tough one to forecast I think. Its is too affected by hot button political issues, and there is a strong interest group working against it.
Basically it relies too much on human decisions, like with regulators etc. If the meat people get their way and its illegal to call cultured meat "meat" and there are massive barriers to entry put up and incredibly exacting food safety standards applied, things could stretch out by decades more.
If animal rights groups gain more power, perhaps as part of the rising worry about climate change and increase in environmental awareness and they get their way we could see bans on regular meat farming in sympathetic countries as soon as cultured meat is remotely competitive. This would result in a much faster expansion of cultured meat and shuttering of regular meat production.
If climate change causes major problems this could disrupt the conventional meat industry, and cause massive shifts to vegetarian and cultured alternatives as everyone panics and tries to pretend they have been doing it all along and it is all someone else's fault. Though this is assuming cultured meat is more efficient, which it could be but that doesn't mean it will be initially, so it could suddenly get dropped as everyone goes full vegetarian in the face of global disaster.
Or climate change will be much less of an issue than expected, and there will be a big backswing of people going "hah see climate change is nothing, fuckit i'm going to double my carbon footprint"
Maybe a religious group in the USA or Israel (which seem to be two of the biggest countries in terms of research, and both have a significant portion of their population that is devoutly religious AFAIK) gets power and influence and you get cultured meat being banned as "unnatural!" or "playing God!" and suddenly progress is set back decades.
(Its a bit like electric cars, we can draw lots of charts, but if the USA bans electric cars or china banned gas cars that's going to suddenly wreck everyone's predictions.)