Assume that monorail will be just north of the airport, and connect to KM25 (N23) Station on the northern (light?) green line extension.
Dark Red Line? Who knows, many moving parts: physical works complete, but need electrics, signaling, rolling stock, Bang Sue terminal which still looks like it's got a long way to go..
2020? 2021?
https://www.skyscrapercity.com/showp...postcount=2739
"Both the northern and the western sections of the Red Line
are due to open next year."
You'll have plenty of heads up when it gets close.