Today's Gospel reading at church was of the land owner who went to the center of town to hire day-laborers for his vineyard. He went back several times over the course of the day and kept hiring whoever was available. At the end of the day, he paid each laborer a full-days wages regardless of whether they had worked one hour or ten.
My belief is that most of Jesus's parables referenced some recent, local event. They were not academic exercises but were very immediate and concrete to the people who first heard them.
It is not just possible but perhaps likely that the event very similar to the one the outlines in the parable had just happened locally. If that were so, then let me sketch out how the locals heard Jesus's message.
The only time in the annual cycle of caring for a vineyard where large numbers of day-laborers would be hired would be for the harvest. 2000 years ago people making wine did not have access to cane sugar or chemicals to control acid levels. Nor did they have fungicides.
Grapes, when they are ripe, have between 20% and 26% sugar. Due to osmosis, the will suck in rain and split (explode) if wetted. If they split, they will immediately start rotting. In the case of an imminent storm, it makes all kinds of economic sense to throw huge amounts of labor at getting the grapes picked and under a roof if a rainstorm threatens.
The traditional homily for this reading is that we can be saved in the 11th hour and if we die in a state-of-grace then we will still go to heaven.
Ironically, I think that is the exact opposite of how the people standing around Jesus heard the parable.
They would have heard this as a call to exercise every means possible to become "righteous" as the thunder-heads loom. It is likely that the owner of the vineyard did not get all of his crop under cover in time. The economics of humans is not the same as the economics of salvation.
I never attended a seminary or studied theology, but I have watched neighbors running wheat and baling hay into the wee-hours when lightning was flashing on the horizon.
Pack your own parachute. Make your own decisions.