Update, vehicle was brought back the dealer in January 2024 we dumped oil, magnetic drain plug had only slight film on it, oil filter was free of metallic particles.
I did another oil change this weekend, and everything looked look vehicle now has 10 000 KM since the original metal shaving discovery.
Like other Highlander owners of the Gen 3 I am now more preoccupied about a potential failure of the 8 speed auto transmission, there have been a ton of reports on Toyota Nation (
https://www.toyotanation.com/thread...1778733/page-2?post_id=14979799#post-14979799 )o f the 8 Speed starting to develop a whine and then a replacement at what seems to be low milage.