In Digambara tradition, a common layperson should not disturb a muni during aahara.

After the aahara is over, one may request upadeśa or seek guidance only in a respectful and proper manner, if the muni is available and permits it. The correct conduct is:

• approach with vinay,
• wait for an appropriate time,
• do not interrupt his dharmic routine,
• accept his time and discipline.

So, yes, one may ask for upadeśa after aahara is completed, but only respectfully and at a proper time. If the muni is resting, occupied, or not available, it is better to wait.