As mentioned on the Southern Railways weekday timetable from Monday 21st - Friday 25th February topic Southern are revising their weekday timetable yet again with effect from Monday 28th February until supposedly Friday 13th May.
https://timetables.southernrailway.com/SN/#/timetables/1093/Table%20K
The details are as follows:
Forest Hill to London Bridge (3 minutes later from Honor Oak Park)
First service at 0535 (0537 from HOP)
Then at 13 & 43 minutes past each hour from 0613 to 2313 with 2 additional services at 0828 & 0858
London Bridge to Forest Hill
First service at 0534
Then at 10 & 40 past each hour from 0610 to 2240
Then 2258, 2310, 2328, 2340, 2358 and 0035
Forest Hill to East Croydon (3 minutes earlier from Honor Oak Park)
First service at 0548
Then at 26 & 56 past each hour from 0626 to 2356 then 0049
East Croydon to Forest Hill
First service at 0520
Then at 27 & 57 past each hour from 0727 to 2257 then 2331
Forest Hill to Victoria (3 minutes earlier from Honor Oak Park)
Only direct service at 2312
Connections via East Croydon available from 0626 (journey time 39 minutes)
Victoria to Forest Hill
Only direct services at 0750 and 0820
Connections via East Croydon available from 0706 to 2235 (journey time 37-38 minutes)
I’d recommended checking live departure apps before travelling though in case of any late notice changes or cancellations!