How is the Sagittarius Arm positioned relative to the Sun's current location?

Roughly 10,000 light-years deeper toward the galactic center.

The spatial relationship between the solar system and the Sagittarius Arm is defined by proximity to the galactic core. The Sun is situated in the Orion Spur at a distance of approximately 26,000 to 27,000 light-years from the core. The Sagittarius Arm is positioned significantly closer to the core than our solar system. Specifically, the nearest edge of the Sagittarius Arm is approximately 10,000 light-years closer to the galactic center than where the Sun resides. This inward positioning means that when observers on Earth look toward the bright center of the galaxy, their sightline passes directly through the dense bulk of the Sagittarius structure.