3D Touch only works on iPad devices running iOS 10, and you must use the iPad Pencil. Press firmly with the Pencil on the app that is waiting to download. This will move the app to the next available download spot, after whichever app is currently updating. The download for the selected app should begin momentarily, as soon as whatever is currently downloading finishes.

TL;DR in Vietnamese:
Ấn giữ ứng dụng đang chờ tải về bằng bút cảm ứng của iPad (iPad Pencil). Chọn "Ưu tiên tải về" từ menu hiển thị. Đợi cho ứng dụng tải xong.