Not having a military background (and I did - not- stay at a Holiday Inn last night), I'd think shells like these (155 mm?) would be full fused and ready to go...
I thought that shells and bombs were always transported unfused because they are relatively safe in this state but, according to google, nowadays, shells can be transported either unfused (with fuses in separate containers) or, if the shells are in sealed packaging, fused.
Safety features on artillery projectiles prevents early activation that handling in the field might cause. This would include transport in trucks, trains, aircraft, etc. Imagine the banging and sliding and crashing in driving through difficult terrain to get to the guns.