I recently signed an offer letter for a new job that starts at the end of this month. The background check through HireRight has been completed and approved by my new employer. I'm now waiting for my company ID and email address from them, but I haven't received those yet. I want to give my current employer three weeks' notice because I feel it's important to help transition my workload and files, especially since my colleagues have been great to work with and are a big reason I’ve stayed this long. I’m feeling a bit anxious about whether it's safe to give my notice now. The new job is with a well-established company that has been around for over 100 years, and I have no reason to believe that my offer would be rescinded. However, I still worry about the possibility of something going wrong before my start date. I've read a lot of advice suggesting that once the background check is cleared and the offer is signed, it's generally safe to proceed. Some comments even suggest that I should wait until after my first day to feel completely secure. But I really want to leave my current job on good terms and provide adequate time for my team to adjust. Should I just go ahead and give my notice now, or is it better to wait a bit longer?