Confirmation from NR that the line will reopen next Monday with almost all work complete between South Tottenham and Gospel Oak (see link below).
Wires do now reach as far as Blackhorse Road but not as far as Queens Rd when I checked last week.
The second blockade starts on 18/11/17 through to 14/1/18 with diesel trains resuming on 15/1/18. Work will be concentrated on the eastern end in terms of stringing wires and getting the last masts in place. The task then transfers to Arriva, TfL and Bombardier to get the electric trains into service (assuming they've arrived by then).