I've been waiting for the day that a tablet could capably replace a dedicated laptop for photography work since I bought the original iPad in 2010. That day seems to be closer than ever with the latest round of iPad Pros. Check out this review of their ability to provide a dedicated workflow for photographers.
While I could pick up a Surface Pro, I've been in the Mac ecosystem for quite some time, and adding a Windows machine is a bit more hassle than I'd prefer. So, I've patiently awaited an iPad that could step up to the plate. The problem is twofold: the device needs the requisite power to handle hefty raw files, and developers need to create workable iOS versions of their applications. The hardware side of things has definitely been met with the iPad Pro, and with Adobe continuing to develop Lightroom Mobile and applications like Affinity Photo filling in for the desktop version of Photoshop, it seems like that time may finally be upon us. This review from Tony and Chelsea Northrup should give you a good idea of the viability of such a workflow and help you decide if now is the right time to add a dedicated tablet.