No, the end-of-session xp award if for PCs only. Extras advance in a different manner.

SW Deluxe Edition p 43:

Don’t create your Extras with the character creation rules. Just give them what you think they ought to have in their various skills and attributes and move on.

While that says nothing about their advancement, it most assuredly sets a certain attitude.

SW Deluxe Edition p 81:

Allies & Experience

 

Allies who take part in battle with their more heroic employers gain experience as well—but not as quickly as player characters. Don’t keep track of their experience points—just roll randomly to see if they’ve “leveled.” At the end of a game session in which the allies had a significant role (usually by participating in combat), roll a d6 for each group of identical troops. On a roll of 5-6, the survivors level up just like player characters and get one Advance. On a failure, they don’t.

That is - roll to see if the allies levelled up whenever you feel like they had a chance.

No, the end-of-session xp award if for PCs only. Extras advance in a different manner.

SW Deluxe Edition p 43:

Don’t create your Extras with the character creation rules. Just give them what you think they ought to have in their various skills and attributes and move on.

While that says nothing about their advancement, it most assuredly sets a certain attitude.

SW Deluxe Edition p 81:

Allies & Experience

Allies who take part in battle with their more heroic employers gain experience as well—but not as quickly as player characters. Don’t keep track of their experience points—just roll randomly to see if they’ve “leveled.” At the end of a game session in which the allies had a significant role (usually by participating in combat), roll a d6 for each group of identical troops. On a roll of 5-6, the survivors level up just like player characters and get one Advance. On a failure, they don’t.

That is - roll to see if the allies levelled up whenever you feel like they had a chance.