Hi. Not to sure what the season is in your area.
It is mid winter here (maybe a frost or 2 only)
I know it is best to do in spring but things go wrong all the time.
autumn is ok.
I do all my cymbidiums before the new roots start to grow in very early spring in Australia.
About early to mid september.
"But" if thing s go wrong I would do it any time but in winter with heavey frost No!.
here in winter it would be ok at a pinch but I would let every thing dry out first.
Repot and be very carefull with the watering.
Now my 2 cents worth. looking at the state it is in I would throw it in the bin and buy a fresh new plant in spring.
Cymbids are so cheep it is not worth all the trouble to try and rescue such plants. Most likely it will take another 2 or 3 years to flower anyway.
If you live in Aussie land I would give a freebee to you.
sorry for the harsh comment but that is what I would do.
Cheerio
Ron.