If the product strategy and positioning isn't nailed down, it will be diffiicult operationalizing a GTM plan.
You need to have alignment on the product messaging, key personas it will benefit, how it will be sold and what the upgrade and expansion paths are. If you don't have those nailed trying to operationalize a GTM plan will be quite difficult.
There are dfinitely many directions to take. I'll try to distill down to two metrics across external & internal GTM KPIs:
The X in days depends on the type of business you're in. For B2C you'll focus on MRR and shorter conversion cycles, likely within the first 15-30 days. For B2B align it with your avg sales cycle for prospects and 75% of the time for customer add-ons.
Most of all empower your XFN team to ensure you have the tactics spelled out, especially in the Angle and Activate sections. (Naming, positioning, core messaging etc). Bring in experts for each A and they will help ensure you have your tactics covered for the launch you would like to complete.
You can find more detail here: Spark's 5A Framework for GTM: