My dad is in the hospital having folfox

Hi all I took my dad last Thursday to the hospital he was jaundice itching and barely walking and so weak the bile duct is not obstructed as we thought its the cancer that has metastasis to the left lobe, he had a resection 2 years a go all the right lobe removed but the surgeon couldn’t have clear margins in brief , when I took him to the hospital I tought it was the end coz he was so weak and couldn’t even walk but after 3 days of hospital he is now waking in the walkway of the hospital and having power again they gave him vitamins by iv and magnesium and calcium the make him stronger he is eating again now thanks god they started the folfox yesterday coz the onc saw him better they infused the oxaliplatin and folinic acid for 2 hours then the 5fu for 40 hours infusion by iv I saw him today he isn’t having any side effect all seems to be going smoothly he still have till tomorrow 2 pm till the 5fu is done then he will have the same regimen in 17 days I would Like to ask you if someone has tried this regimen and what is the response? How long do we need. To wait to know if the chemo is shrinking the tumors can we do a blood test after the first cycle is done directly to know if the chemo is working??