You should have received a dispatch email confirming which item(s) from your order have been dispatched.
If something hasn't been dispatched, it's worth checking your order confirmation to refer to any pre-order timeframes provided at the time of purchase.
Remember that, items being delivered by Parcel or One-Man Delivery will be dispatched separately, as and when they are ready. Two-Man Deliveries are held until all item(s) are ready, so remember to refer to the latest estimated delivery timeframe for these.