Not quite where you guys are but since you're the closest comparison I can go with..... My Box Elder sap here is starting to slow down, Next few days look promising. Have collected 165 gallons of sap total this year as our trees don't produce the amount of say your maples do. 1-1/2% though so that's good. Early syrup was very light in color while the latter is dark. Awesome taste! Just short of 2 gallons of syrup from over 125 taps.....
Jim
Home made 2' X 5' X 6" pan.
Home made 500 gallon wood fired cooker
2019 - 12 taps, 1/2 gallon Box Elder syrup
2020 - 120 taps ………..
This hobby is addicting...…..