Webster’s 1913 has no entry under this spelling.
Shades of meaning
Fernald has no entry of its own for harvest-time; he lists it under harvest.
Where he writes about it:
As regards time, harvest, harvest-tide, and harvest-time alike denote the period or season when the crops are or should be gathered (tide being simply the old Saxon word for time). — from harvest
Harvest-home ordinarily denotes the festival of harvest, and when used to denote simply the season always gives a suggestion of festivity and rejoicing, such as harvest and harvest-time by themselves do not express. — from harvest