Earlier this year I already added <https://osm.org/relation/17312830>, with
restriction:conditional=no_right_turn @ ("If sign illuminated")

There seems to be dotted turning guide lines on the road, and right-turn arrow traffic signals, so it doesn’t appear to be a full-time restriction.

Not sure what else to do, unless you know what times the turn restriction is active, or there is a better way to mark it as part-time.