the ている/ています thing works for other verbs as well
for example, in Goblin Slayer, episode 3, around minute 12:25
the Priestess says: そんな、せめて決める前に相談とか [そんな、せめてきめるまえにそうだんとか]
which means something like "that's not fair, at least, before deciding, please consult" or "that's not fair, you should consult (me) before making a decision"
Goblin Slayer responds: しているだろ
which means "I'm doing it now", this could be more explicit adding 今 [いま], as in 今、してるだろ, but it should still be clear
だろ is "the informal to the point of almost being rude" version of でしょう which means something like "isn't it" or "am I not", by itself it doesn't mean anything, but it's similar to ね (as in いい天気ですね [いいてんきですね])
for example 好きだろ [すきだろ] means "you like, don't you?" it could be "you like her, don't you?" or "you like it, don't you?" depending on the subject of the conversation
