The $K^{+} \to \pi^{0} e^{+} \nu \gamma$ decay process has been studied by the NA62 experiment with the data collected in 2017 and 2018 runs. The preliminary results with measurements of the branching fraction (normalized to $K^{+} \to \pi^{0} e^{+} \nu$ channel) and of the T-violation, that improve the experimental state of the art, are presented.