Short answer: Yes—if it is still daylight where you are.

Ekashana (one complete meal in a day) should be taken after sunrise and finished before sunset. So taking your single meal at 3:00 pm is acceptable, provided sunset has not occurred yet at your location.

Basic points to observe:

• One sitting, one complete meal; no second helping later.
• After the meal, no more food that day. Follow your tradition’s rule for water (generally only boiled water in the daytime; many observe no water after sunset).
• Prefer completing the meal well before sunset to avoid inadvertent night-eating.

Tradition notes:

• Shvetambar and Digambar lay codes both keep meals in daylight and avoid night-eating. Specifics (e.g., water after sunset) vary by local/teacher guidance—follow the rule you have taken.