This quest-line is not time-limited and unlocks the Simoleon Sprout and (access to) the LP Lotus (which costs Real Money!)
This quest has been last verified on the Family Furnishings update (July 2019)
Please note that times may differ from the ones listed due to the star-level of the objects.
I have closed the comments for this post, if you are having trouble, please use the unofficial forum, there are many people there who can and likely will answer your questions: http://simsfp.perturbee.net
Technical support (if your game does not work as expected, like no goals, no building options, crashes and such) use: https://firemonkeys.zendesk.com/
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Based on a work at http://simfsfp.blogspot.com.