As of today, the Delta Squadron Battleboard shows us holding 5 Squadron Citations. That puts us on par with Tempest (5) and behind Theta (190) and on the Squadron Battleboard (the Battleboard also lists the rules for citations).
While getting to first place on this list by beating Theta with their eons of combat experience seems unattainable today, we can surely make a comfortable second place with some margin.

1. The following battles currently only need one more Delta pilot to fly them to achieve a Citation:

• TIE-CAB 1
• TIE-TC 246
• XvT-TC 41
• XvT-TC 77
• XvT-TC 84
• XvT-TC 96
• XvT-TC 99
• XvT-TC 116

2. The following battles currently only need two more Delta pilots to fly them to achieve a Citation:

• TIE-TC 1
• TIE-TC 31
• TIE-TC 32
• TIE-TC 33
• TIE-TC 34
• TIE-TC 35
• TIE-TC 36
• TIE-TC 37
• TIE-TC 38
• TIE-TC 39
• TIE-TC 41
• TIE-TC 43
• TIE-TC 44
• TIE-TC 48
• TIE-TC 50
• TIE-TC 51
• TIE-TC 52
• TIE-TC 53
• TIE-TC 54
• TIE-TC 55
• TIE-TC 56
• TIE-TC 168
• XvT-TC 14
• XvT-TC 20
• XWA-TC 1
• XWA-TC 2
• XWA-TC 3
• XWA-TC 4
• XWA-TC 5
• XWA-TC 6
• XWA-TC 7
• XWA-TC 8
• XWA-TC 9
• XWA-TC 10
• XWA-TC 11
• XWA-TC 12
• XWA-TC 21
• XWA-TC 22
• XWA-TC 23
• XWA-TC 24
• XWA-TC 25
• XWA-TC 26
• XWA-TC 27
• XWA-TC 39

• Pilot who completes the most battles: IS-SW
• Pilot who completes the 2nd most battles: IS-BW
• First 10 battles completed: IS-CW