Are Roth contributions to a 457(b) deferred compensation plan considered excess contributions when AGI exceeds $208,000 (married, filing jointly)?

A 457(b) plan is an employer plan. If your 457(b) has a Roth option, there is a contribution limitation, not an income limitation. 

A 457(b) plan’s annual contributions and other additions (excluding earnings) to a participant’s account cannot exceed the lesser of:

1. 100% of the participant's includible compensation, or
2. the elective deferral limit ($20,500 in 2022; $19,500 in 2020 and in 2021).

There are additional rules for catch-up contributions. To learn more see: Retirement Topics - 457(b) Contribution Limits

A 457(b) plan is not an IRA.  Roth IRA contribution limitations have nothing to do with a Roth account in a 457(b) plan.

Would you know if there's a delay for the advance refund from the IRS?

Please clarify. The IRS does not issue Advance Refunds.

I did my taxes through turbotax and I was approved for an refund Advance through credit karma,   I received text messages at 2:30 AM saying that my credit karma account balance is $4000 but credit karma saying they have no pending deposits and they also said that the advancement is coming from the IRS

Check out our FAQ regarding when you will get your Refund Advance. For additional information, please visit the Credit Karma Help Center or call Credit Karma toll-free at 833-588-0232.

@Mrmasby81