On the last day, check the cold preserves in the pot - if it's the desired consistency, with big chuncks of fruit and dense liquid, you can wash and sterilize the jars.
When the jars are ready and dry, set the pot over heat again, boil for 5 minutes, then ladle the preserves into jars.
If you think it's still too runny after boiling, I recommend leaving it another 24 hours on the table.