You will want to submit your application on the earliest date possible. For the 2023-2024 cycle that is September 6th, 2023 at 9 AM. Additionally, you will want to register with the national resident matching program (NRMP) on September 15th, 2023. This will provide you access to the software where you will eventually submit your match list. Importantly, residency programs can review applications starting September 27th, 2023. Thus, in order to maximize success with interviews you will want all materials uploaded to ERAS by this point.