If RTT is to be believed, there are no late night services west of Paddington from the eastern branches. They operate between Paddington XR and Shenfield/Abbey Wood.
Late night services to the west start from Paddington NR.
Define "late night"; I can see trains arriving past midnight that originated at Abbey Wood. Shenfield services are not booked to operate past Paddington all day anyway.
But yes otherwise Paddington and Liverpool St high level have the very last departures, so a change is required.
Realtime Trains | 9N00 2306 Abbey Wood to Maidenhead | 07/11/2022
Real-time train running information for 9N00 2306 departure from Abbey Wood to Maidenhead on 07/11/2022. From Realtime Trains, an independent source of train running info for Great Britain.