I've just sent a bunch of transactions yesterday using 1 sat/byte but today the mempool is not as empty as yesterday:
https://jochen-hoenicke.de/queue/#0,2dIf you aren't in a hurry, I guess 2 sat / byte are fine and will be confirmed later tonight.
I've noted some patterns to anticipate when the Mempool gets empty (second part):
Make sure to avoid wasting BTC for too high fees step by step guide (Electrum)- After around 08:00 CET, the transaction volume tends to increase, around 23:00 the Mempool empties gradually (these times can vary, sometimes its starting earlier, sometimes later)
- Between 02:00 and 08:00 CET is the best time to send Bitcoin, when the Mempool is emptied regularly)
- Monday is often the busiest time
- During the weekend the Mempool is usually much emptier than during the week, even at rush hour
Keep in mind that these patterns may change at any time, especially when BTC is increasing in price, many users doing transactions, so the fees will most likely also increase.