They hit the target for bronze last June, and by October had more than 90 percent of the gold and 85 percent of the silver.
All medals for the Tokyo 2020 Olympics will be made from metal collected by recycling electronic waste, games organisers have said.
The latest estimation is that all three goals will be achieved by using devices already donated, but just to be safe, the collection effort is set to continue until late March.More news: Google's Adiantum encyrption designed for slower chips
"Thanks to the huge levels of support from the public and companies across Japan and from national and global athletes, it is estimated that the remaining amounts of metals required to manufacture all Olympic and Paralympic medals can be extracted from the devices already donated", Tokyo 2020 said in the press statement.
Making up those tons of waste is an astounding five million old smartphones, all of which were voluntarily recycled by Japanese citizens at NTT Docomo stores.
The committee met its target of 2,700kg of bronze in June 2018, while nearly 94 percent of the 30.3kg gold target and over 85 percent of the 4,100kg silver target was met in October. The IOC requires gold medals to contain at least six grams of gold and 92.5 percent silver, and gold medals at the 2018 PyeongChang Olympics were worth about $570 each.More news: Hacienda closing down unit where incapacitated woman gave birth
The organizers aimed to collect 30.3kg of gold, 4,100kg of silver and 2,700kg of bronze, and the target is expected to be reached by March.
Tokyo 2020 will release the designs of its medals later this year.More news: Important: M&S is selling a heart-shaped sausage for Valentine's Day