Hi karert,
Assuming that you won't run into any technical problems if you take the At-home GMAT, the more relevant issues are ultimately about how well you have trained for whichever version of the Exam you are going to take and how close you are to your overall Score Goal.
The 'format' of the At-home Exam is fixed (Quant, then Verbal - with no break in-between, then an optional 5-minute break, then IR). Having to take Quant and Verbal in one sitting is challenging for many Test Takers (especially if you've been taking your CATs with an 8-minute break between sections). If you choose to take your GMAT at a Test Center, then it's likely that you will have to wear a face mask during the entirety of your Exam - and that might also take some getting used to. Either way, you will probably need some time to practice for the exact format that you will face - and if you have not been doing that, then you might want to consider pushing back your upcoming Test Date.
Before I can offer you any additional advice, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied? How many hours do you typically study each week?
2) What study materials have you used so far?
3) On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your overall goal score?
5) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich