CSOT already works in motor as documented in pymongo: https://pymongo.readthedocs.io/en/latest/examples/timeouts.html#pymongo-timeout-is-asyncio-safe

timeout() is asyncio safe; the timeout only applies to current Task and multiple Tasks can configure different timeouts concurrently. timeout() can be used identically in Motor, for example:

import motor.motor_asyncio
client = motor.motor_asyncio.AsyncIOMotorClient()
coll = client.test.test
with pymongo.timeout(10):
    await coll.insert_one({"name": "Nunu"})
    await coll.find_one({"name": "Nunu"})

However we probably want to add documentation examples in motor itself.