You should be fine. If you are taking the Hikari train to Shin-Osaka then you have a comfortable 38 min connection to the Haruka train to KIX. In the rare event that the first train is delayed and you miss the connection, the next train is half an hour later which still arrives 1:10 before departure, stilll before the checkin cut off.
you would need a pretty serious about event, such a very rare fatality on the line, to delay youenough to miss the flight.