Lance has covered the concept -- you have to mentally fly the approach backwards from the touchdown zone back up to the IAF.
In this case, the TDZE is 124, so your intended result is to reach 124 MSL in the TDZ. Note also that the TDZ is about 3/4 mile southwest of the VOR. Therefore, you want to be at 124 feet 3/4 mile from the VOR. The MDA is 620, so you have 500 feet to lose once you spot the field, and that will take about 1-1/4 miles at a "normal rate of descent" (see 91.175(c)(1) for the significance of that phrase). Thus, you want to be at MDA and looking at least 2 miles before reaching the VOR, so you'll have to finish the PT far enough out to get down there at least 2 miles before the VOR.
The PT altitude is 2000 feet, giving you 1380 feet to lose to reach MDA, which (at a typical 500 ft/min) is about 3 minutes (including time to initiate the descent and level off at the bottom). Assuming a 90-knot approach, that's about 4-1/2 miles, which means you must have the PT completed at least 6-1/2 miles from the VOR. Since a "standard" PT at 90 knots will drop you about a mile further out than you start it (you can get out your drafting tools or geometry book and confirm this), you must be at 2000 feet (I hate descending PT's -- they're an invitation to an altitude bust) no later than 5-1/2 miles outbound on the 241 radial. At 90 knots, that's 3:40 after crossing the VOR, which is plenty of time to get down from 3000 to 2000, although if for whatever reason they have you cross the VOR at 4000 rather than 3000, you'll be far enough out before you reach 2000 feet.
Note that if you fly a different speed or descent rate, you can massage the numbers accordingly -- it's the planning that's important, not the specific numbers.
Therefore, if I'm flying this approach, I'll hack the clock when I complete the turn to the heading to intercept the radial outbound (PIC's Turn and then Time concept -- no fiddling with clocks or radios in the turn), and start the PT at 3:40 or reaching 2000, whichever comes last. BTW, if it looks like the controller has set me so high that I can't get down to 2000 by 8 miles from the VOR (the farthest point of a PT at 90 knots being about 2 miles from where you start it), I'll tell the controller up front that I need a turn in holding at the VOR to lose some altitude.
This may seem like a lot, but after you do it a few times, you can do it in your head pretty quickly just looking at the profile view. Before you get to that skill level, sit down before the flight, study all the approaches for your destination, and pencil in your planned outbound time.
One final note -- this approach is an example of why having visibility equal to the published flight vis minimum doesn't necessarily mean you can safely complete the approach to a landing with book-minimum visibility. If you don't see the runway environment until 1 mile slant range from the runway, you will need a pretty good descent rate to lose 500 feet (MDA to TDZE) in less than a mile (ground distance being shorter than slant range, and it takes some distance to get from level at MDA to descending at your desired descent rate). This may result in either something other than "normal maneuvers" or more than the "normal rate of descent" discussed in 91.175(c)(1) -- at 90 knots approach speed, we're talking close to 1000 ft/min to make this work, and that's a bit scary at less than 500 AGL in crummy visibility.
