Interesting how things work in different areas or in different times. Standard here (many moons back) was at tender stage the payment stages were subnitted as part of the tender with a typical standard of 25% payable at halfway, again at three quarters and again at finish with the final payment three months after finish.
Never any question of upfront payments. and delayed final payment was to find or sort any problems.
The idea was, if you couldn't substancially finance a contract, you shouldn't be tendering.
Anyone who tendered was expected to finance the first half, and if they couldn't, they were assumed to be cowboys.