Well depending on your source material, D&D is somewhere in the 14-16th century Europe level of technology. You have steel production, some long-distance sailing, gunpowder muskets if you want to go that way.
If you follow that European model, you'd go into the 16th-18th century European level of technology. You have the Scientific Revolution, Enlightenment, etc. The printing press could make a significant impact on your world. If knowledge of magic is just now disseminating into humanity, tomes on magic and magic research could quickly be widespread. More thinkers, natural philosophers, and the like might delve into how magic works, causing a Magical Revolution of sorts.