It's not necessary in the sentence, and if you leave it out I think it makes no difference at all in meaning. Is it taken from a character speaking with a 'Deep South' dialect? (Deep South = the Southern States of the USA)

It means 'a (little) bit of'. Time for some dancing->Here, some might mean a lot of.

Thank you for your answer. Yes, your guess was exactly what was intended to say.

This doesn't sound very natural to my ear in this context. You'd generally just say "The plums are ready for picking". (This is about the plums, not the picker.) Perhaps "Some plums are ready for picking" is what is intended?