You can't increase font-size for newsfeed status only, the font-size will increase in every newsfeed item in the newsfeed content area

Is it ok, if so, I can provide you the styles. 

no

Ok you can do this by applying this style: 

.ow_newsfeed_item[data-entity-type=user-status] .ow_newsfeed_content{

font-size: YOUR VALUE

}