For those who have beat the main story and the dragon born DLC,

So my character is level 50 by doing side stuff etc but I have yet to complete the main quest line and have yet to play the dragon born dlc quest line, my question is if I play the dragonborn DLC Q'line will it spoil the main story if I haven't played through all of it yet?

Which to do first? My intention is to leave the main story until the very end and beat it with a strong leveled character.. Thank you in advance!

You have to complete the Skyrim MQ part where the Greybeards teach you Whirlwind Sprint, before the MQ of Dragonborn will start. I would personally do the Dragonborn MQ after the Skyrim MQ, but I'm sure it can be done in any order after you meet the Greybeards.

Thanks for the reply^^ I left the MQ after dragon rising where now I have to meet Delphine again, I'm just worried if I play dragonborn Q'line it will reveal main quest story spoilers that I have yet to find out