From National Rail website:
So as before when Southern Railways have been unable to operate any of their usual services into Victoria Station they will be operating many of the services to and from London Bridge instead. To accommodate these services they won’t be operating the London Bridge - East Croydon & v.v stopping service all 4 days, Saturday’s London Bridge - Victoria & v.v stopping service via Crystal Palace or Sunday’s London Bridge - Crystal Palace & v.v stopping service.
The only Southern services that will operate to and from Forest Hill and Honor Oak Park are:
Forest Hill - London Bridge
Good Friday, Easter Saturday & Easter Monday @ 0558, 0628 and 0658
Easter Sunday @ 2346
London Bridge - Forest Hill
Good Friday & Easter Monday @ 2310, 2340, 2358 & 0035
Easter Saturday @ 2310, 2358 & 0035
Easter Sunday @ 0713 & 2350
London Overground will be operating as usual all weekend in both directions.