Postgres - update

Team,

I have following SQL

UPDATE dbo."UnitStatement" as TblNav

SET "NAV" = TblNav."NAV"

FROM dbo."NAV" as TblNav

WHERE TblUnit."FundId" = TblNav."FundId"

AND TblUnit."UnitDate" = TblNav."Date"

record # unitstatement - 2211664

record # nav - 213172

I have following this to understand.

1. in realife how much time it should take? ( I cancelled it after 2+ hrs)

2. I apply index on TblUnit."FundId" & TblNav."FundId" ( But still not able to boost the perfromance)

Please help to boost the performance of above query