I have received couple of trees from online order. Portulacaria, Metasequoia, Chinese elm and Shrubby cinquefoil. The pics were taken inside, trees are outside, will put Elm inside when cold enough, Portulacaria already in.

Not quite sure if i should repot them before the winter or should i wait till the spring. The soil looks organic to me, that's why i am thinking if i should replant them in to a 'proper' soil mixture. Because of the soil type, it feels moist, so i am not sure if i should water them (they were in boxes, probably couple of days).

Metasequoia root ball, it just slips out of the pot
Portulacaria - some white stuff on all the trees. Something they use when shipping plants?

Images attached.

Thanks for all the answers.