When I asked what the gravity is (above), I mean now — after the 3 to 4 days post pitch. If a floating hydrometer is in use, and it was calibrated (temp and specific gravity), then it would indicate current temp and gravity (within a tolerance).
I use a TILT in every brew because I want to know when fermentation kicks off without going to the basement and, as fermentation slows, when to raise the temp for a D rest. It is unreliable for finished gravity IMO but it is a decent tool to judge progress.
I do not like it when fermentation takes a long time to start. I would pitch a pack of dry yeast and call it a day.
I have had really good experience with fast starts using go-ferm to rehydrate in a Mason jar, let it sit ~ 15 -20 min, shake the bageezes out of it a few times during a brewday, then adding Fermax as a nutrient prior to pitch, shake again to mix, and pitch. I have been seeing hours vs days wait time.