I haven’t been in the situation that you describe regarding your 401(k). My understanding is that you don’t have to make an RMD withdrawal from your 401(k) until the calendar year following your retirement. If you retire before 31 December 2022, you can transfer your 401(k) to your IRA using a custodian to custodian transfer without penalty. The 31 December 2022 balance in your IRA will determine your 2023 RMD.
If your 401(k) retirement plan allows transfers to an IRA after age 60, another option is to do the custodian to custodian transfer now except for investments in your current employer’s stock. Stop contributions to your 401(k) and use a NUA to empty your 401(k) of the employer’s stock when you retire.