It’s 50/50, could be a legit after few days of no reversal of the money from your bank. There are many stolen Zelle accounts, where they send you money from the victims accounts and ask you for their money back, they even offer you to keep some of it for your troubles.. You can do your due diligence with the bank to make sure it’s legit. Usually Zelle payments are not reversible, but the gouverment has been going after the banks due to a lot of frauds.