What’s your current TL? (status stars count)
How many weeks do you intend to prep for the effort?
Can you train more hours/week as you approach the target date for the climb or is 8 hours a realistic cap?
Sprint TT is the start of the endurance quadrant in Xert. Best to train above that considering your goal. The more likely Focus choice would be Climber or GC Specialist.
With XATA on Continuous ATP the recommendations will include a variety of HIT workouts at or near the selected Focus Type when your calculated form is blue/fresh and LIT endurance work recommended when yellow/tired.
With XATA on Challenge the focus is specific to selected target type over a 30-day period.
XATA Base-Build-Peak is a long term traditional-ish phased progression over 120 days (shorter if Base already established).
With XFAI you can create forecast plans with a target date. For example, a Goal forecast for an increase in Climber power or the Race AI option as @ManofSteele suggests.
I wouldn’t worry too much about whether you can actually ride at X watts for an hour considering the original FTP study was based on a bell curve ranging from 40-70 minutes.
TP isn’t derived in the same manner as FTP but the numbers serve a similar purpose.
TP represents the highest power that can be sustained without accumulating short-term fatigue when MPA begins to decline.
What’s more important than matching TP with FTP is whether you can effectively train with your calculated Fitness Signature. You’ll know that soon enough after a few HIT workouts or if a LIT workout around LTP does not feel like Z2.
If necessary your signature can be adjusted to work best for you.
It’s useful to note the difference in terms in Xert compared to traditional platforms and why they differ. TP vs FTP, XSS vs TSS, etc.
While some content is dated you should find my onboarding tips of value –
Onboarding steps for Xert trial users and newbies - General - Xert Community Forum