Apologies for the late response. A financial institution can submit targets prior to commitment approval. And FIs can now book slots for validation of their near-term targets via the booking system: SBTi Target Validation Booking System (jotform.co)
Please note that submission forms will need to be completed and uploaded in order to book a slot. Also, the date of the booked slot is when the review of the target submission will begin, and not the date that target validation results will be delivered.