Monitor mains voltage for a short period of time

I would like to monitor the mains voltage of about AC 360 Vpeak for a couple of minutes.  I have a TDS 3054B oscilloscope and P6139A 10x voltage probe.  I would be grateful if someone advise me how to set up the measurement safely and correctly.  Thanks

It would be best to use a high voltage probe like P5202A with your TDS3054B for this purpose
https://www.tek.com/en/datasheet/high-voltage-differential-probes