For all coatings, including Future:
Tack dry—coating still soft and tacky, but not removed by light contact.
Touch dry—coating not deformed by normal, light handling, but not fully cured. Not a good time to apply decals. This is usually the best recoat time.
Cure dry—essentially complete polymerization of coating. Some solvents may still be present and slowly migrating out. Some coatings continue to polymerize for a long time after initial cure, becoming harder and tougher with time. May not be the best time to apply decals.
Somewhere in here is where you should apply decals, preferably closer too:
Hard cure or solvent-free cure—no more solvent escaping from the paint. For some coatings, this can take a very long time. That is rarely the case for most modeling paints unless applied in a very thick coat, and the instructions usually warn you if it is.
Future reaches cure dry very quickly, but does not reach a solvent free state for some time after that. I also
suspect it is one of those coatings that becomes harder and tougher as it ages.