I get the following coma diameters from comphot:

2022-11-22.9	23 arcsec
2022-11-23.9	28 arcsec
2022-11-24.9	34 arcsec
2022-11-25.9	40 arcsec

At the comet's distance of 5.3 au, one arcsecond corresponds to around
3,800 km. The observed radius is expanding at around 3 arcsec/day which
implies an average expansion velocity of around 130 m/s.

The attached animation shows the expansion. The field of view is 2.4
arcmin square which corresponds to approx. 550,000 km at the comet.

Nick.