Meta E4/E5 AI SWE offer chances?

Finished a virtual onsite with Meta for an E4/E5 SWE AI role. Here is my experience: Coding 1: Finished 1 easy/medium level bit manipulation question. Had a good discussion with interviewer regarding cache optimizations. Interviewer seemed happy with solution. The next problem was an open ended linalg coding question. Was able to code up initial implementation + 1 step optimization, however it seemed my interviewer wanted me to solve it with a diff design (ran out of time). I would say I passed this round but could have done better with the second question. AI Design 1: Open ended design question with many areas to dive deep. Was able do discuss many of the high level components of design. Interviewer seemed to have similar experience in the stack as me: was able to answer most questions/followups with confidence. OK interview overall, not exceptional, not bad. Interviewer was nice, seemed to look forward to working w me. AI Design 2: This might have been my best interview, was able to answer all of the questions/follow ups my interviewer had prepared. Interviewer mentioned I had finished all of the follow-up Q with ease. Good vibes overall. Follow ups were pretty high level, did not have to answer any specific/hard questions. Interviewer seemed happy with my answers. Coding 2: was given a linalg easy level problem that is on LC. Had not seen this problem before. Discussed different ways to solve. Interviewer nudged me into the right direction and was able to find the solution and code it up quickly. Wrote optimal CPP solution. I have my doubts if the interviewer thought I needed a hint to find the solution. Q2 was a medium level question, I had seen something similar. I quickly pointed out a trivial way to solve using sort. Interviewer wanted a better solution. I knew how to solve this problem using optimized sorting algo so proceeded to implement that. Tested my solution for both problems with examples. Interviewer pointed out few errors while implementing. Interviewer was poker face, I even think he did not like me. Behavioral: STAR method. Prepared different situations and tried to adapt my experience to answer the behavioral Qs. OK interview. Edit 1: Received Offer for E4