How about the term "just-in-time?" It is used in the context of manufacturing. For example, it describes a factory manufacturing system where the raw materials are brought in as they are needed.
https://en.wiktionary.org/w/index.php?title=just-in-time&oldid=45591851
Example: "Acme Widget Manufacturing uses a just-in-time inventory system in their factories."
Perhaps you could adapt it to your own needs.