Setting realistic deadlines for your team

I recently got promoted to Team Lead, worked my ass off to get here! As an individual contributor, I’ve always completed tasks quickly. If something takes other people 4-5 days, I’d finish it out in 1-2. Naturally, this set an unexpected standard, but I know that’s not how it works for everyone in a team. And I don't want to be that asshole who thinks if I can then everyone can.

I want my team to have the freedom to set their own timelines while ensuring they’re growing and delivering at their best. For all the TLs and managers out there...how do you keep the balance between setting realistic deadlines without compromising productivity or product quality? Would love to hear your approach!