Recently, the tipster Max J. asserted that OnePlus would introduce its first-ever smartwatch in October 2020. Now, the same leaker claims that this launch has been postponed, possibly due to development issues with the new product. The OEM apparently does not have a new date for the event at this time.
https://www.notebookcheck.net/The-OnePlus-Watch-launch-originally-slated-for-October-2020-is-pushed-back-indefinitely.499881.0.html